Fix reporting of Win32::Process::Create() errors.

Per its documentation, it reports via GetLastError(), not $!.

Author: nmisch

Makefile.PL

@@ -16,7 +16,7 @@ if ( $^O ne 'MSWin32' ) {
     }
 }
 else {
-    $PREREQ_PM{'Win32'}             = '0.27';     # for CSIDL_SYSTEM
+    $PREREQ_PM{'Win32'}             = '0.27';
     $PREREQ_PM{'Win32::Process'}    = '0.14';
     $PREREQ_PM{'Win32::ShellQuote'} = 0;
     $PREREQ_PM{'Win32API::File'}    = '0.0901';

lib/IPC/Run/Win32Helper.pm

@@ -523,7 +523,12 @@ sub win32_spawn {
         1,    ## Inherit handles
         0,    ## Inherit parent priortiy class. Was NORMAL_PRIORITY_CLASS
         ".",
-    ) or croak "$!: Win32::Process::Create()";
+      )
+      or do {
+        my $err = Win32::FormatMessage( Win32::GetLastError() );
+        $err =~ s/\r?\n$//s;
+        croak "$err: Win32::Process::Create()";
+      };
 
     for my $orig_fd ( keys %saved ) {
         IPC::Run::_dup2_rudely( $saved{$orig_fd}, $orig_fd );