Various Win32 and other fixes for warnings and compilation errors.

Fix Win32 build system to use 'Makefile' instead of 'Makefile.ssl'.

util/mk1mf.pl

diff --git a/util/mk1mf.pl b/util/mk1mf.pl
index 1581346..202371c 100755
--- a/util/mk1mf.pl
+++ b/util/mk1mf.pl
@@ -10,7 +10,7 @@
 $ssl_version="";
 $banner="\t\@echo Building OpenSSL";
 
-open(IN,"<Makefile.ssl") || die "unable to open Makefile.ssl!\n";
+open(IN,"<Makefile") || die "unable to open Makefile!\n";
 while(<IN>) {
     $ssl_version=$1 if (/^VERSION=(.*)$/);
     $OPTIONS=$1 if (/^OPTIONS=(.*)$/);