SystemTools: Fix build with SunCC/stlport.

The <fcntl.h> header needs to be included before <string> is included
when using stlport. Otherwise:

"SystemTools.cxx", line 1240: Error: UTIME_OMIT is not defined.
"SystemTools.cxx", line 1240: Error: UTIME_NOW is not defined.
"SystemTools.cxx", line 1241: Error: AT_FDCWD is not defined.

Change-Id: I3441ae3a7007c53ad97dea42ec48fedca8cc010c

SystemTools.cxx

@@ -18,6 +18,10 @@
 
 #if defined(_WIN32) && (defined(_MSC_VER) || defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__MINGW32__))
 #  define KWSYS_WINDOWS_DIRS
+#else
+#  if defined(__SUNPRO_CC)
+#    include <fcntl.h>
+#  endif
 #endif
 
 #include "kwsysPrivate.h"