makepkg.conf: Change CHOST on linux to x86_64-redhat-linux
makepkg.conf: Change CHOST on linux to x86_64-redhat-linux

This fixes setting proper zlib SONAME, which used to
fallback to an empty value due to the unrecognized
"x86_64-linux-gnu-gcc" compiler. This led to bundles broken
after removing shared library symlinks.

abusalimov/clion-bundle-buildenv