Remove unnecessary memset in DNS resolution
Revert "Avoid rewriting menu strings while computing boundaries"

This reverts commit 3b549f53306f25349392807920f46e237b1d8c1b.

The previous commit was based on the false assumptions that the input
text was immutable and had no tab characters in it.  Both assumptions
were wrong.
Respect LDFLAGS on Windows
Declare OpenGL functions before defining them
Make OglLibPath const char []