Fixed Visual C++ release build for Visual C++ 2005

* Some math functions become intrinsic in release mode, so we need to
  convert all the math functions into SDL math functions, like we did
  with the stdlib functions.
* Constant initializers of 8-bit values become calls to memset() in
  release mode, but memset() itself is an intrinsic when explicitly
  called.  So we'll just explicitly call memset() in those cases.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403474

include/SDL_config_win32.h

@@ -116,6 +116,18 @@ typedef unsigned int uintptr_t;
 #define HAVE__STRICMP 1
 #define HAVE__STRNICMP 1
 #define HAVE_SSCANF 1
+#define HAVE_M_PI 1
+#define HAVE_COPYSIGN 1
+#define HAVE_COS 1
+#define HAVE_COSF 1
+#define HAVE_FABS 1
+#define HAVE_FLOOR 1
+#define HAVE_LOG 1
+#define HAVE_POW 1
+#define HAVE_SCALBN 1
+#define HAVE_SIN 1
+#define HAVE_SINF 1
+#define HAVE_SQRT 1
 #else
 #define HAVE_STDARG_H	1
 #define HAVE_STDDEF_H	1