NMake Compatibility (Part 1)

Removed the quote protectiona round the 'make' binary calls, which ultimately failed when 'nmake' was the binary being used.   The '$make' variable has additional parameters tacked onto it if 'nmake' is being used, and quoting it here causes those extra parameters to get quoted as well (rather than just the path to the binary, which I assume was the intent).
NMake Compatibility (Part 2)

Added quotes surrounding the 'make' binary path prior to returning it to the invoking code, which (when coupled with 75f1dcd00e37f8338a8c71ec77aebe21522e2b85) should take care of the issues building on Win32 platforms with 'nmake'.
Added Missing Quotes

Added missing quotes surrounding the '$make' variable.
Merge pull request #160 from jrmash/master

NMake/Win32 Compatibility