Overhaul makefiles with @nalimilan to conform to standard packaging guidelines
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Update relative_path.sh to throw an error on relative paths instead of burning CPU cycles faster than CERN burns money
Windows has strange pathing
Don't need to mess around with gmp either
Change windows bindir and co
Pass $(MAKE_COMMON) to submodules
Fix typo
Don't forget to create $(bindir) before trying to install stringpatch
Pass $(MAKE_COMMON) to llvm as well
Set PROJ_libdir as well