syscall: allow for mksyscall_windows.pl to be used outside of syscall

this change should have been part of fafcd328da73

R=golang-dev, bsiegert
CC=golang-dev
https://golang.org/cl/5462045

diff --git a/src/pkg/syscall/mksyscall_windows.pl b/src/pkg/syscall/mksyscall_windows.pl
index 0daca2eded2c4c2f2fd4c5bfed2f4e66991854a6..1fb51125bd14e6a908955988d6d3a83f292146a1 100755 (executable)
--- a/src/pkg/syscall/mksyscall_windows.pl
+++ b/src/pkg/syscall/mksyscall_windows.pl
@@ -263,7 +263,7 @@ while(<>) {
                } elsif($rettype eq "error") {
                        # Set $reg to "error" only if returned value indicate failure
                        $body .= "\tif $reg != 0 {\n";
-                       $body .= "\t\t$name = Errno($reg)\n";
+                       $body .= "\t\t$name = ${syscalldot}Errno($reg)\n";
                        $body .= "\t}\n";
                } else {
                        $body .= "\t$name = $rettype($reg)\n";