Make sure only allowed gcc versions are used

Author: FloopCZ

tensorflow_cc/cmake/build_tensorflow.sh.in

@@ -61,9 +61,7 @@ if [ "$cuda_allowed" == true ] && [ "$cuda_available" == true ]; then
 
     # choose the right version of CUDA compiler
     if [ -z "$GCC_HOST_COMPILER_PATH" ]; then
-        if   hash gcc 2>/dev/null && version_gt 10.3 `gcc -dumpversion`; then
-            export GCC_HOST_COMPILER_PATH=${GCC_HOST_COMPILER_PATH:-"/usr/bin/gcc"}
-        elif hash gcc-10 2>/dev/null && version_gt 10.3 `gcc-10 -dumpversion`; then
+        if hash gcc-10 2>/dev/null && version_gt 10.3 `gcc-10 -dumpversion`; then
             export GCC_HOST_COMPILER_PATH=${GCC_HOST_COMPILER_PATH:-"/usr/bin/gcc-10"}
         elif hash gcc-9 2>/dev/null && version_gt 9.4 `gcc-9 -dumpversion`; then
             export GCC_HOST_COMPILER_PATH=${GCC_HOST_COMPILER_PATH:-"/usr/bin/gcc-9"}