242779287f
CentOS 7.5 has too old c++/g++/gcc(<version 5) in /usr/bin.
They cannot support __has_attribute, thus build failure will
happen.
Remove hardcoded /usr/bin path so that the target version will
be selected via PATH. For example in CentOS,
PATH=/opt/rh/devtoolset-7/root/usr/bin:$PATH, c++/g++/gcc will
be from /opt/rh/devtoolset-7/root/usr/bin.
Change-Id: Id77c54127eb0b9960e78897af75cfc3666d85689
[ROCm/hip commit: b253a4617b]