dtc: Don't use env(1) in testsuite
dtc: Don't use env(1) in testsuite

The run_tests.sh script currently invokes the testcase binaries via
env(1).  This behaviour is inherited from the libhugetlbfs testsuite
which uses this approach to easily set various configuration
environment variables in testcases.

We don't use that for dtc, and are unlikely to ever want to.
Therefore this patch removes that technique, which substantially
speeds up the testsuite.

Signed-off-by: David Gibson <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@gibson.dropbear.id.au>

t2m-foxfone/android_kernel_lk,oubeichen/lk-v500,oubeichen/lk-v500,jbott/lk_gee,Redmi-dev/android_bootable_lk,Foxda-Tech/argo8-bootable-bootloader-lk,mozilla-b2g/fairphone2_kernel_lk,chirayudesai/android_bootable_bootloader_lk,oubeichen/lk-v500,idor/dk50-bootable_bootloader_lk,Redmi-dev/android_bootable_lk,CanarySolutions/little-kernel,M1cha/lktris,utilite2/lk,chirayudesai/android_bootable_bootloader_lk,mozilla-b2g/kernel_lk,hanjae/lumiab0,jsr-d10/android_bootable_bootloader_lk,pichina/lk,t2m-foxfone/android_kernel_lk,Blefish/android_bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,M1cha/lktris,oubeichen/lk-v500,M1cha/mi2_lk,Redmi-dev/android_bootable_lk,RonGokhale/android_lk_bootloader,Foxda-Tech/argo8-bootable-bootloader-lk,t2m-foxfone/android_kernel_lk,M1cha/mi2_lk,jsr-d10/android_bootable_bootloader_lk,Redmi-dev/android_bootable_lk,mozilla-b2g/kernel_lk,Blefish/android_bootable_bootloader_lk,jsr-d9/android_kernel_lk,lg-devs/g2-bootloader,detule/lk-g2-spr,mozilla-b2g/kernel_lk,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,jsr-d9/android_kernel_lk,jbott/lk_gee,Foxda-Tech/polaris-bootable-bootloader-lk,Blefish/android_bootable_bootloader_lk,efidroid/lk,utilite2/lk,detule/lk-g2-spr,M1cha/android_bootable_bootloader_lk,zhuotong/mi2_lk_NoEmmc,M1cha/mi2_lk,utilite2/lk,t2m-foxfone/kernel_lk,pichina/lk,mozilla-b2g/fairphone2_kernel_lk,thornbirdblue/codeaurora_lk,mozilla-b2g/fairphone2_kernel_lk,jbott/lk_gee,jsr-d10/android_bootable_bootloader_lk,MiCode/mi2_lk,RonGokhale/android_lk_bootloader,detule/lk-g2-spr,utilite2/lk,hanjae/lumiab0,lg-devs/g2-bootloader,DooMLoRD/android_bootable_bootloader_lk,DooMLoRD/android_bootable_bootloader_lk,mozilla-b2g/kernel_lk,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/mi2_lk,DooMLoRD/android_bootable_bootloader_lk,hanjae/lumiab0,M1cha/android_bootable_bootloader_lk,RonGokhale/android_lk_bootloader,CanarySolutions/little-kernel,jsr-d9/android_kernel_lk,detule/lk-g2-spr,M1cha/mi2_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,zhuotong/mi2_lk_NoEmmc,efidroid/lk,idor/dk50-bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,lg-devs/g2-bootloader,zhuotong/mi2_lk_NoEmmc,efidroid/lk,RonGokhale/android_lk_bootloader,Foxda-Tech/polaris-bootable-bootloader-lk,t2m-foxfone/kernel_lk,M1cha/lktris,jsr-d9/android_kernel_lk,chirayudesai/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,detule/lk-g2-spr,t2m-foxfone/android_kernel_lk,t2m-foxfone/kernel_lk,t2m-foxfone/kernel_lk,zhuotong/mi2_lk_NoEmmc,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,thornbirdblue/codeaurora_lk,MiCode/mi2_lk,zhuotong/mi2_lk_NoEmmc,hanjae/lumiab0,jbott/lk_gee,pichina/lk,jsr-d9/android_kernel_lk,thornbirdblue/codeaurora_lk,M1cha/android_bootable_bootloader_lk,RonGokhale/android_lk_bootloader,Redmi-dev/android_bootable_lk,t2m-foxfone/kernel_lk,DooMLoRD/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,Blefish/android_bootable_bootloader_lk,pichina/lk,CanarySolutions/little-kernel,MiCode/mi2_lk,jbott/lk_gee,mozilla-b2g/fairphone2_kernel_lk,MiCode/mi2_lk,efidroid/lk,thornbirdblue/codeaurora_lk,jsr-d10/android_bootable_bootloader_lk,chirayudesai/android_bootable_bootloader_lk,MiCode/mi2_lk,t2m-foxfone/android_kernel_lk,CanarySolutions/little-kernel,DooMLoRD/android_bootable_bootloader_lk,hanjae/lumiab0,thornbirdblue/codeaurora_lk,oubeichen/lk-v500,lg-devs/g2-bootloader,M1cha/lktris,Blefish/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,chirayudesai/android_bootable_bootloader_lk,lg-devs/g2-bootloader,pichina/lk,M1cha/lktris,utilite2/lk,mozilla-b2g/kernel_lk