hip: fix naming of libraries when installing from tarballs (#20780)

There's two issues with hip where it tries to autodetect the patch
version number from git (when installed), but it does not check if it
even is inside of a git repo. The result is we end up with a shared lib
with a trailing dash in the library suffix: `libamd64.so.x.y.z-`, which
confuses GCC. The patch tries to check if the `.git` folder exists, and
if it does not, it handles version numbering the same as when git was
not installed previously.

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