revert to gcc 4.9.3 due to ABI problems with existing user applications

board/GfA/Display001/BUILD

@@ -1 +1 @@
-654
+655

configs/Display001_4.4.145_bone23_Qt5.7_defconfig

@@ -2,12 +2,13 @@ BR2_arm=y
 BR2_cortex_a8=y
 BR2_ARM_INSTRUCTIONS_THUMB2=y
 BR2_DL_DIR="~/buildroot_dl"
-BR2_HOST_DIR="/opt/GfA/TC_L44104_C540_QT57"
+BR2_HOST_DIR="/opt/GfA/TC_L44104_C493_QT57"
 # BR2_COMPILER_PARANOID_UNSAFE_PATH is not set
 BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
 BR2_KERNEL_HEADERS_4_4=y
 BR2_GLIBC_VERSION_2_24=y
 BR2_BINUTILS_VERSION_2_27_X=y
+BR2_GCC_VERSION_4_9_3=y
 BR2_TOOLCHAIN_BUILDROOT_CXX=y
 BR2_PACKAGE_HOST_GDB=y
 BR2_PACKAGE_HOST_GDB_TUI=y