contrib/buildsystems: handle the curl library option

Upon seeing the '-lcurl' option, point to the libcurl.lib.

While there, fix the elsif indentation.

Signed-off-by: Philip Oakley <philipoakley@iee.org>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/buildsystems/engine.pl

@@ -341,10 +341,12 @@ sub handleLinkLine
             $appout = shift @parts;
         } elsif ("$part" eq "-lz") {
             push(@libs, "zlib.lib");
-	} elsif ("$part" eq "-lcrypto") {
+        } elsif ("$part" eq "-lcrypto") {
             push(@libs, "libeay32.lib");
         } elsif ("$part" eq "-lssl") {
             push(@libs, "ssleay32.lib");
+        } elsif ("$part" eq "-lcurl") {
+            push(@libs, "libcurl.lib");
         } elsif ($part =~ /^-/) {
             push(@lflags, $part);
         } elsif ($part =~ /\.(a|lib)$/) {