builtin: Simplify linking with libgc #19

Open programmingkidx wants to merge pr/26695 into master · last Mar 6

Currently V fails to run on Mac OS 10.4 because a feature called rpath is sent to the linker. This feature is only available on Mac OS 10.5 and higher. To fix compatibility with versions of Mac OS X before 10.5, the linking has been simplified to statically link to libgc.a.