cpu/esp32: fixes LINKFLAGS in Makefile.include
cpu/esp32: fixes LINKFLAGS in Makefile.include

removes the duplicate entry of -lg in LINKFLAGS
x3ro/RIOT,BytesGalore/RIOT,toonst/RIOT,BytesGalore/RIOT,aeneby/RIOT,authmillenon/RIOT,kaspar030/RIOT,miri64/RIOT,jasonatran/RIOT,smlng/RIOT,kaspar030/RIOT,aeneby/RIOT,josephnoir/RIOT,OlegHahm/RIOT,smlng/RIOT,A-Paul/RIOT,mfrey/RIOT,kaspar030/RIOT,mtausig/RIOT,ant9000/RIOT,miri64/RIOT,authmillenon/RIOT,josephnoir/RIOT,yogo1212/RIOT,basilfx/RIOT,rfuentess/RIOT,OlegHahm/RIOT,ant9000/RIOT,x3ro/RIOT,mtausig/RIOT,kYc0o/RIOT,aeneby/RIOT,smlng/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,basilfx/RIOT,aeneby/RIOT,A-Paul/RIOT,rfuentess/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,mfrey/RIOT,OTAkeys/RIOT,BytesGalore/RIOT,A-Paul/RIOT,cladmi/RIOT,basilfx/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,rfuentess/RIOT,toonst/RIOT,yogo1212/RIOT,ant9000/RIOT,mtausig/RIOT,ant9000/RIOT,lazytech-org/RIOT,x3ro/RIOT,basilfx/RIOT,lazytech-org/RIOT,A-Paul/RIOT,basilfx/RIOT,cladmi/RIOT,toonst/RIOT,x3ro/RIOT,lazytech-org/RIOT,jasonatran/RIOT,jasonatran/RIOT,OTAkeys/RIOT,authmillenon/RIOT,gebart/RIOT,aeneby/RIOT,kYc0o/RIOT,cladmi/RIOT,josephnoir/RIOT,rfuentess/RIOT,miri64/RIOT,ant9000/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,josephnoir/RIOT,gebart/RIOT,toonst/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,josephnoir/RIOT,gebart/RIOT,gebart/RIOT,kYc0o/RIOT,miri64/RIOT,yogo1212/RIOT,rfuentess/RIOT,jasonatran/RIOT,yogo1212/RIOT,BytesGalore/RIOT,kaspar030/RIOT,authmillenon/RIOT,mtausig/RIOT,smlng/RIOT,jasonatran/RIOT,smlng/RIOT,A-Paul/RIOT,x3ro/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,toonst/RIOT,kYc0o/RIOT,authmillenon/RIOT,miri64/RIOT,mfrey/RIOT,kaspar030/RIOT,kYc0o/RIOT,cladmi/RIOT,lazytech-org/RIOT,gebart/RIOT,mfrey/RIOT,mfrey/RIOT,cladmi/RIOT,authmillenon/RIOT,mtausig/RIOT