contrib: gnutls: Don't use LoadLibraryA

contrib/src/gnutls/gnutls-loadlibrary.patch

+--- gnutls/lib/system.c.orig	2016-07-08 14:39:45.104700999 +0200
++++ gnutls/lib/system.c	2016-07-08 14:40:28.276750643 +0200
+@@ -322,7 +322,7 @@
+ #ifdef _WIN32
+ #if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) && __MINGW32_MAJOR_VERSION <= 3 && __MINGW32_MINOR_VERSION <= 20
+ 	HMODULE crypto;
+-	crypto = LoadLibraryA("Crypt32.dll");
++	crypto = LoadLibrary(TEXT("Crypt32.dll"));
+ 
+ 	if (crypto == NULL)
+ 		return GNUTLS_E_CRYPTO_INIT_FAILED;
+--- gnutls/lib/system-keys-win.c.orig	2016-07-08 14:39:58.336716261 +0200
++++ gnutls/lib/system-keys-win.c	2016-07-08 14:40:12.568732630 +0200
+@@ -1059,7 +1059,7 @@
+ 	int ret;
+ 
+ #ifdef DYN_NCRYPT
+-	ncrypt_lib = LoadLibraryA("ncrypt.dll");
++	ncrypt_lib = LoadLibrary(TEXT("ncrypt.dll"));
+ 	if (ncrypt_lib == NULL) {
+ 		return gnutls_assert_val(GNUTLS_E_CRYPTO_INIT_FAILED);
+ 	}

contrib/src/gnutls/rules.mak

@@ -22,6 +22,7 @@ gnutls: gnutls-$(GNUTLS_VERSION).tar.xz .sum-gnutls
 ifdef HAVE_WIN32
 	$(APPLY) $(SRC)/gnutls/gnutls-win32.patch
 	$(APPLY) $(SRC)/gnutls/gnutls-mingw64.patch
+	$(APPLY) $(SRC)/gnutls/gnutls-loadlibrary.patch
 ifdef HAVE_WINSTORE
 	$(APPLY) $(SRC)/gnutls/gnutls-winrt.patch
 	$(APPLY) $(SRC)/gnutls/winrt-topendir.patch