Revert "Fixed curl failing to build for Windows"

Failed to apply this patch after dependency upgrades. Maybe it's fixed,
or maybe we need to reapply it to resolve conflicts.

```
16:24:44 if [ "mingw" = mingw ]; then patch -p1 < "/home/jenkins/workspace/testing-pr/label/PACKAGES_i386_mingw/libcurl/pkg"/fix-curl-windows.patch; fi
16:24:44 patching file configure
16:24:44 Hunk #1 FAILED at 41895.
16:24:44 Hunk #2 succeeded at 48695 (offset 310 lines).
16:24:44 1 out of 2 hunks FAILED -- saving rejects to file configure.rej
```

This reverts commit 4512cfe.

Author: larsewi

deps-packaging/libcurl/debian/rules

@@ -24,13 +24,6 @@ build: build-stamp
 build-stamp:
 	dh_testdir
 
-	# Fixes following issue on Windows build
-	# 15:44:06 url.c: In function 'zonefrom_url':
-	# 15:44:06 url.c:1802:18: error: implicit declaration of function 'if_nametoindex' [-Werror=implicit-function-declaration]
-	# 15:44:06        scopeidx = if_nametoindex(zoneid);
-	# 15:44:06                   ^
-	if [ "$(OS)" = mingw ]; then patch -p1 < "$(CURDIR)"/fix-curl-windows.patch; fi
-
 	./configure --with-sysroot=$(PREFIX) \
 				--host=$(DEB_HOST_GNU_TYPE) \
 				--with-ssl=$(SSL_PREFIX) \
@@ -51,7 +44,7 @@ build-stamp:
 				CPPFLAGS="-I$(PREFIX)/include" \
 
 	make
-
+	
 	touch build-stamp
 
 install: build