[DISCO_F746NG] missing gcc_arm in targets.py
[DISCO_F746NG] missing gcc_arm in targets.py

'normal' tests are OK, RTOS builds fail:

+--------------+--------------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
| Result | Target | Toolchain | Test ID | Test Description | Elapsed Time (sec) | Timeout (sec) | Loops |
+--------------+--------------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
| OK | DISCO_F746NG | GCC_ARM | DTCT_1 | Simple detect test | 0.5 | 10 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | EXAMPLE_1 | /dev/null | 3.43 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_10 | Hello World | 0.36 | 5 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_11 | Ticker Int | 11.37 | 15 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_12 | C++ | 1.37 | 10 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_16 | RTC | 4.74 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_2 | stdio | 0.8 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_23 | Ticker Int us | 11.35 | 15 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_24 | Timeout Int us | 11.37 | 15 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_25 | Time us | 11.37 | 15 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_26 | Integer constant division | 1.38 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_34 | Ticker Two callbacks | 11.4 | 15 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_37 | Serial NC RX | 10.91 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_38 | Serial NC TX | 15.4 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_A1 | Basic | 1.36 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_A21 | Call function before main (mbed_main) | 1.43 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_A9 | Serial Echo at 115200 | 6.51 | 20 | 1/1 |
| OK | DISCO_F746NG | GCC_ARM | MBED_BUSOUT | BusOut | 2.27 | 15 | 1/1 |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_1 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_2 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_3 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_4 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_5 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_6 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_7 | Toolchain build failed | 0 | 0 | - |
| BUILD_FAILED | DISCO_F746NG | GCC_ARM | RTOS_8 | Toolchain build failed | 0 | 0 | - |
+--------------+--------------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
Result: 8 BUILD_FAILED / 18 OK

svogl/mbed-os,HeadsUpDisplayInc/mbed,screamerbg/mbed,radhika-raghavendran/mbed-os5.1-onsemi,NXPmicro/mbed,nvlsianpu/mbed,tung7970/mbed-os,HeadsUpDisplayInc/mbed,HeadsUpDisplayInc/mbed,rgrover/mbed,mikaleppanen/mbed-os,bulislaw/mbed-os,CalSol/mbed,svogl/mbed-os,mmorenobarm/mbed-os,adustm/mbed,fanghuaqi/mbed,bikeNomad/mbed,kjbracey-arm/mbed,j-greffe/mbed-os,pradeep-gr/mbed-os5-onsemi,Shengliang/mbed,catiedev/mbed-os,rosterloh/mbed,betzw/mbed-os,getopenmono/mbed,NXPmicro/mbed,c1728p9/mbed-os,nabilbendafi/mbed,c1728p9/mbed-os,infinnovation/mbed-os,karsev/mbed-os,nvlsianpu/mbed,bcostm/mbed-os,tung7970/mbed-os-1,mikaleppanen/mbed-os,jeremybrodt/mbed,tung7970/mbed-os-1,tung7970/mbed-os-1,mbedmicro/mbed,fahhem/mbed-os,j-greffe/mbed-os,screamerbg/mbed,RonEld/mbed,YarivCol/mbed-os,fanghuaqi/mbed,pradeep-gr/mbed-os5-onsemi,catiedev/mbed-os,monkiineko/mbed-os,fvincenzo/mbed-os,theotherjimmy/mbed,radhika-raghavendran/mbed-os5.1-onsemi,bulislaw/mbed-os,svogl/mbed-os,Shengliang/mbed,bikeNomad/mbed,adustm/mbed,getopenmono/mbed,svogl/mbed-os,NXPmicro/mbed,bikeNomad/mbed,maximmbed/mbed,theotherjimmy/mbed,fvincenzo/mbed-os,rosterloh/mbed,nabilbendafi/mbed,cvtsi2sd/mbed-os,betzw/mbed-os,Shengliang/mbed,monkiineko/mbed-os,cvtsi2sd/mbed-os,mikaleppanen/mbed-os,cvtsi2sd/mbed-os,screamerbg/mbed,CalSol/mbed,kl-cruz/mbed-os,maximmbed/mbed,Archcady/mbed-os,theotherjimmy/mbed,ryankurte/mbed-os,jrjang/mbed,rgrover/mbed,adamgreen/mbed,rgrover/mbed,svogl/mbed-os,arostm/mbed-os,nabilbendafi/mbed,mbedmicro/mbed,adustm/mbed,mazimkhan/mbed-os,DanKupiniak/mbed,infinnovation/mbed-os,theotherjimmy/mbed,ARM-software/mbed-beetle,jrjang/mbed,pradeep-gr/mbed-os5-onsemi,maximmbed/mbed,rosterloh/mbed,Shengliang/mbed,bulislaw/mbed-os,monkiineko/mbed-os,nRFMesh/mbed-os,getopenmono/mbed,cvtsi2sd/mbed-os,dbestm/mbed,screamerbg/mbed,tung7970/mbed-os,YarivCol/mbed-os,ARM-software/mbed-beetle,j-greffe/mbed-os,mmorenobarm/mbed-os,getopenmono/mbed,svastm/mbed,adamgreen/mbed,kpurusho/mbed,nvlsianpu/mbed,jrjang/mbed,YarivCol/mbed-os,geky/mbed,arostm/mbed-os,nvlsianpu/mbed,kl-cruz/mbed-os,mazimkhan/mbed-os,nRFMesh/mbed-os,rgrover/mbed,rosterloh/mbed,andcor02/mbed-os,andreaslarssonublox/mbed,fahhem/mbed-os,kjbracey-arm/mbed,pradeep-gr/mbed-os5-onsemi,pedromes/mbed,karsev/mbed-os,ARM-software/mbed-beetle,j-greffe/mbed-os,getopenmono/mbed,monkiineko/mbed-os,mazimkhan/mbed-os,tung7970/mbed-os,adustm/mbed,bentwire/mbed,mikaleppanen/mbed-os,Tiryoh/mbed,bcostm/mbed-os,c1728p9/mbed-os,kpurusho/mbed,bcostm/mbed-os,arostm/mbed-os,c1728p9/mbed-os,geky/mbed,ryankurte/mbed-os,nRFMesh/mbed-os,Archcady/mbed-os,bulislaw/mbed-os,CalSol/mbed,Archcady/mbed-os,CalSol/mbed,RonEld/mbed,HeadsUpDisplayInc/mbed,radhika-raghavendran/mbed-os5.1-onsemi,andreaslarssonublox/mbed,dbestm/mbed,jeremybrodt/mbed,ryankurte/mbed-os,fahhem/mbed-os,infinnovation/mbed-os,svastm/mbed,andcor02/mbed-os,j-greffe/mbed-os,karsev/mbed-os,netzimme/mbed-os,nabilbendafi/mbed,adustm/mbed,nabilbendafi/mbed,fanghuaqi/mbed,infinnovation/mbed-os,fahhem/mbed-os,fanghuaqi/mbed,nRFMesh/mbed-os,mbedmicro/mbed,YarivCol/mbed-os,cvtsi2sd/mbed-os,kl-cruz/mbed-os,nRFMesh/mbed-os,mmorenobarm/mbed-os,catiedev/mbed-os,kl-cruz/mbed-os,infinnovation/mbed-os,pedromes/mbed,ARM-software/mbed-beetle,dbestm/mbed,dbestm/mbed,netzimme/mbed-os,tung7970/mbed-os-1,fahhem/mbed-os,jeremybrodt/mbed,c1728p9/mbed-os,jeremybrodt/mbed,tung7970/mbed-os,arostm/mbed-os,betzw/mbed-os,theotherjimmy/mbed,monkiineko/mbed-os,kl-cruz/mbed-os,adamgreen/mbed,fvincenzo/mbed-os,tung7970/mbed-os,Tiryoh/mbed,getopenmono/mbed,mmorenobarm/mbed-os,bentwire/mbed,bentwire/mbed,rgrover/mbed,Tiryoh/mbed,ryankurte/mbed-os,c1728p9/mbed-os,jrjang/mbed,ryankurte/mbed-os,pradeep-gr/mbed-os5-onsemi,jeremybrodt/mbed,mmorenobarm/mbed-os,betzw/mbed-os,DanKupiniak/mbed,geky/mbed,tung7970/mbed-os-1,adamgreen/mbed,dbestm/mbed,kpurusho/mbed,kjbracey-arm/mbed,adamgreen/mbed,bentwire/mbed,mmorenobarm/mbed-os,karsev/mbed-os,pedromes/mbed,radhika-raghavendran/mbed-os5.1-onsemi,karsev/mbed-os,andreaslarssonublox/mbed,jrjang/mbed,YarivCol/mbed-os,Tiryoh/mbed,rosterloh/mbed,kjbracey-arm/mbed,netzimme/mbed-os,netzimme/mbed-os,jrjang/mbed,theotherjimmy/mbed,dbestm/mbed,kpurusho/mbed,svastm/mbed,mazimkhan/mbed-os,NXPmicro/mbed,andreaslarssonublox/mbed,maximmbed/mbed,Shengliang/mbed,mikaleppanen/mbed-os,catiedev/mbed-os,DanKupiniak/mbed,fvincenzo/mbed-os,pedromes/mbed,RonEld/mbed,rosterloh/mbed,radhika-raghavendran/mbed-os5.1-onsemi,RonEld/mbed,catiedev/mbed-os,netzimme/mbed-os,mbedmicro/mbed,bikeNomad/mbed,radhika-raghavendran/mbed-os5.1-onsemi,screamerbg/mbed,kl-cruz/mbed-os,nRFMesh/mbed-os,fanghuaqi/mbed,arostm/mbed-os,bcostm/mbed-os,fvincenzo/mbed-os,karsev/mbed-os,screamerbg/mbed,bulislaw/mbed-os,adamgreen/mbed,ryankurte/mbed-os,andcor02/mbed-os,adustm/mbed,pedromes/mbed,pradeep-gr/mbed-os5-onsemi,CalSol/mbed,RonEld/mbed,Archcady/mbed-os,geky/mbed,andcor02/mbed-os,bentwire/mbed,andreaslarssonublox/mbed,betzw/mbed-os,Archcady/mbed-os,HeadsUpDisplayInc/mbed,HeadsUpDisplayInc/mbed,infinnovation/mbed-os,andcor02/mbed-os,YarivCol/mbed-os,mazimkhan/mbed-os,andcor02/mbed-os,fahhem/mbed-os,cvtsi2sd/mbed-os,Shengliang/mbed,DanKupiniak/mbed,NXPmicro/mbed,mbedmicro/mbed,nabilbendafi/mbed,pedromes/mbed,Archcady/mbed-os,maximmbed/mbed,geky/mbed,netzimme/mbed-os,bentwire/mbed,nvlsianpu/mbed,betzw/mbed-os,bcostm/mbed-os,bikeNomad/mbed,arostm/mbed-os,monkiineko/mbed-os,mazimkhan/mbed-os,svastm/mbed,Tiryoh/mbed,bcostm/mbed-os,kpurusho/mbed,NXPmicro/mbed,maximmbed/mbed,mikaleppanen/mbed-os,bulislaw/mbed-os,Tiryoh/mbed,RonEld/mbed,svastm/mbed,svogl/mbed-os,kpurusho/mbed,nvlsianpu/mbed,j-greffe/mbed-os,catiedev/mbed-os,CalSol/mbed