Revert "strongswan: fix build issues around PARSE_ERROR"

@tobiasbrunner is asserting that this patch is no longer
necessary with 6.x.

This reverts commit 89fa8033b8.

net/strongswan/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=strongswan
 PKG_VERSION:=6.0.2
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://download.strongswan.org/ https://download2.strongswan.org/

net/strongswan/patches/0100-work-around-parse_error-clash.patch

@@ -1,11 +0,0 @@
---- a/src/libstrongswan/plugins/wolfssl/wolfssl_plugin.c
-+++ b/src/libstrongswan/plugins/wolfssl/wolfssl_plugin.c
-@@ -27,6 +27,8 @@
- #include <library.h>
- #include <utils/debug.h>
- 
-+#define PARSE_ERROR	WOLFSSL_PARSE_ERROR
-+
- #include "wolfssl_plugin.h"
- #include "wolfssl_aead.h"
- #include "wolfssl_crypter.h"