[Mesa-dev] Build warnings cleanup

[Emil Velikov]

Cleanup series addressing a few warnings spotted by gcc        

Note: the first patch is a recent from previously, which despite     
it's evasive looks is quite trivial

Feel free to commit, as I do not have access


[PATCH 1/4] gallium-egl: Use native types rather than EGL ones
[PATCH 2/4] nvc0: Silence uninitialized variable warning in the
[PATCH 3/4] glsl ast_to_hir: Silence uninitialized variable warnings
[PATCH 4/4] glsl opt_flip_matrices: Silence unused variable warning