Moved the SDL version back to SDL_version.h

Added a comment at the top of SDL.h with the current version, for informational purposes

build-scripts/wikiheaders.pl

@@ -13,7 +13,7 @@ my $wikisubdir = '';
 my $incsubdir = 'include';
 my $readmesubdir = undef;
 my $apiprefixregex = undef;
-my $versionfname = 'include/SDL.h';
+my $versionfname = 'include/SDL_version.h';
 my $versionmajorregex = '\A\#define\s+SDL_MAJOR_VERSION\s+(\d+)\Z';
 my $versionminorregex = '\A\#define\s+SDL_MINOR_VERSION\s+(\d+)\Z';
 my $versionmicroregex = '\A\#define\s+SDL_MICRO_VERSION\s+(\d+)\Z';