add hexfloat (%a) support for printf
Avoid undefined checks for types that are always fully initialized
Denesting of functions definitions.
Fix of parseintperf

The code was generating random values between 0 and 2^31-1 instead of 0 and 2^32-1 as the other implementations.
Prevent constant propagation in fib microbenchmark
Build libgit2 as a dependency, for now requiring CMake
Add libgit2 to the default build
Add OPTS and start tracking libgit2's HEAD
Bump libgit2 to 0.21.0
Fix the Makefile for Linux

Linux uses puts the version at the end of the soname, while OS X puts
it in the middle. Also, case issues.
`make install` now correctly installs libgit2
fixes for Windows cross-compile
add quotes around $(CC) for libgit

also move libgit2 license link to the right section,
and remove command-line git from Versions.make
only send base compiler name to cmake
add a stub test to check libgit2 library version
add cmake and libgit2 info to README.md
also add cmake instructions to README.windows.md

remove notes about issues that should be fixed
Keep track of number of initialized fields and avoid undefined checks
Add -Bsymbolic-functions on Linux
bump libgit2 to v0.21.2