Add libgit2 to dependencies. This is up for review and testing, since
building with CMake and tup doesn't go down well just yet. Test!
Fix bin not being created when running bootstrap.sh
Fix getdeps not actually checking the if dependency is already locally
installed.
Add libgit2.so to list of Tupfile dependencies.
Fix libgit2 creating too many files that are not needed
Fix output libgit2.so.0 not recorded
Fix bootstrap.sh deleting config every run. Now only writes a tup.config
file if it doesn't already exist.
Fix libgit2.so not being added in Tupfile, due to misplaced
close-parenthesis.
Add -Wl,--as-needed to LDFLAGS.
Fix libgit2 not building correctly (hopefully. test this!)
Add linker and include paths from libgit2 to Tuprules.tup.