Fix errors on Visual Studio (patch by sunside227)

git-svn-id: http://libfixmath.googlecode.com/svn/trunk/libfixmath@90 d3e1167c-abe1-51d5-8199-f9061ebe54e4
Fix compile error on GCC

git-svn-id: http://libfixmath.googlecode.com/svn/trunk/libfixmath@91 d3e1167c-abe1-51d5-8199-f9061ebe54e4