Minor MingW patches backported from dev branch.

CHANGELOG

@@ -4,6 +4,7 @@
 
 -- stuff in the stable-1.0 branch, backported from 2.0.0 dev branch, etc ---
 
+09062005 - Happy September. Minor MingW fixes (but it's still broken, I think).
 07232005 - Fixed bug in zip archiver (thanks, Jörg Walter!). Updated zlib to
            1.2.3, which properly includes the security fix. Fixed "make dist"
            to handle .svn dirs and other file changes. Removed "debian"

configure.in

@@ -383,8 +383,13 @@ fi
 AC_MSG_RESULT([$this_is_cygwin])
 
 AC_MSG_CHECKING([if this is mingw])
+if test x$target_os = xmingw32; then
+  this_is_mingw=yes
+fi
 if test x$target_os = xmingw32msvc; then
   this_is_mingw=yes
+fi
+if test x$this_is_mingw = xyes; then
   PHYSFSCFLAGS="$PHYSFSCFLAGS -DWIN32"
   enable_cdrom=yes
   enable_pthreads=no

platform/win32.c

@@ -25,7 +25,7 @@
 
 #if (defined _MSC_VER)
     #define alloca(x) _alloca(x)
-#elif (defined MINGW)  /* scary...hopefully this is okay. */
+#elif (defined __MINGW32__)  /* scary...hopefully this is okay. */
     #define alloca(x) __builtin_alloca(x) 
 #endif