Try to use stdint.h with gcc <= 4.4

There's no way to tell whether the architecture has its stdint.h, as
__UINT_FAST64_TYPE__ built in define didn't exist yet. Redefining the
types would break the build, and chances are we're not on some exotic
architecture where stdint would be missing, so let's assume it exists.

src/pstdint.h

@@ -191,7 +191,7 @@
  *  do nothing else.  On the Mac OS X version of gcc this is _STDINT_H_.
  */
 
-#if ((defined(__STDC__) && __STDC__ && __STDC_VERSION__ >= 199901L) || (defined (__WATCOMC__) && (defined (_STDINT_H_INCLUDED) || __WATCOMC__ >= 1250)) || (defined(__GNUC__) && (defined(_STDINT_H) || defined(_STDINT_H_) || defined (__UINT_FAST64_TYPE__)) )) && !defined (_PSTDINT_H_INCLUDED)
+#if ((defined(__STDC__) && __STDC__ && __STDC_VERSION__ >= 199901L) || (defined (__WATCOMC__) && (defined (_STDINT_H_INCLUDED) || __WATCOMC__ >= 1250)) || (defined(__GNUC__) && (defined(_STDINT_H) || defined(_STDINT_H_) || defined (__UINT_FAST64_TYPE__) || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ <= 4)) )) && !defined (_PSTDINT_H_INCLUDED)
 #include <stdint.h>
 #define _PSTDINT_H_INCLUDED
 # ifndef PRINTF_INT64_MODIFIER