vimacs/centos7-packages: My custom CentOS 7 packages.

Iru Cai 32a69932c6 gcc: add zstd build option		2 lat temu
..
gcc-static-libsanitizer.patch	8dd610db43 gcc: patch to use static libsanitizer	2 lat temu
gcc.spec	90d6700041 gcc,zstd: add %post %postun	2 lat temu
hosttools-gcc.spec	32a69932c6 gcc: add zstd build option	2 lat temu