Add build folder as Include for generated files
Add install option for copying Fortran mod files to include folder
Add PRI defines to win32defs file
Exclude mingw from extra flags
flags for GCC compilers version 4.8 and above.
Removed files from gnu-warnings that only apply to versions < 4.8.
Consolidated warnings from versions < 4.8 that apply to versions >= 4.8
into the 4.8 warnings files.
