[Win32] Define $Config{i_stdckdint} and I_STDCKDINT when appropriate

Author: sisyphus

MANIFEST

@@ -6788,6 +6788,7 @@ win32/config_H.gc			Win32 config header (MinGW build)
 win32/config_h.PL			Perl code to convert Win32 config.sh to config.h
 win32/config_H.vc			Win32 config header (Visual C++ build)
 win32/config_sh.PL			Perl code to update Win32 config.sh from Makefile
+win32/configure/have_stdckdint.c	check for availability of stdckdint.h
 win32/configure/rt.c			identify default runtime
 win32/create_perllibst_h.pl		creates perllibst.h file for inclusion from perllib.c
 win32/distclean.bat			Remove _ALL_ files not listed here in MANIFEST

win32/config_sh.PL

@@ -148,6 +148,12 @@ my $ver = `ver 2>nul`;
 $opt{osvers} = $ver =~ /\b(\d+(?:\.\d+)+)\b/ ? $1 : '4.0';
 
 if (exists $opt{cc}) {
+    `$opt{cc} -o have_stdckdint.exe configure/have_stdckdint.c 1>nul 2>&1`;
+    if  (-e 'have_stdckdint.exe') {
+        $opt{i_stdckdint} = 'define' if `have_stdckdint` eq '0';
+        unlink 'have_stdckdint.exe'; # have_stdckdint.exe no longer needed
+    }
+
     # cl version detection borrowed from Test::Smoke's configsmoke.pl
     if ($opt{cc} =~ /\b(?:cl|icl)/) { #MSVC can come as clarm.exe, icl=Intel C
         my $output = `$opt{cc} 2>&1`;