Remove all functions for which the HAVE_ define is not used anywhere.

Add _strdup, _strtoi64 _strtoui64, chsize, strdup and vsnprintf which
are all present in MSVC headers.

These defines aren't needed. Move the X_DISPLAY_MISSING and __ASM_*
defines to after the PACKAGE_* defines to match config.h.in.

Update list of headers present in the MSVC build environment. fcntl.h
isn't detected by configure and so isn't needed.

Factor out writing of common compiler settings and setting of common defines.

Factor out the writing of HAVE_* defines in include/config.h and sort
the resulting defines before writing.

msvcmaker: Fix the generated filename for the spec file for modules with extensions other than .dll.

This gets make_opengl to work again with Perl 5.10.

This prevents the target from changing during the first PreLoad() call
on a surface, which would be inconvenient when attaching a surface to
a FBO for example.

This creates a function for setting the texture name and one for
setting the texture target. The idea is that the texture target should
get set right after the surface is created, and won't change, while
generating a texture name can wait.