textproc/libxml2: fix build with VALIDATION option off

Grab two commits from upstream that fix the build when
--no-valid is passed to configure; in the ports build
that translates to the VALIDATION option turned off.
These come straight from GNOME GitLab, although I've
bunged them into one patch-* file.

Not bumping PORTREVISION, since with this option off
it would never have built, and with the option on
the resulting package is unchanged.

PR:		253596

textproc/libxml2/Makefile

@@ -7,13 +7,6 @@ CATEGORIES?=	textproc gnome
 MASTER_SITES=	http://xmlsoft.org/sources/
 DIST_SUBDIR=	gnome2
 
-# CVE-2019-20388, CVE-2020-7595, CVE-2020-24977, Python 3.9 support
-#PATCH_SITES=	https://gitlab.gnome.org/GNOME/libxml2/commit/
-#PATCHFILES=	7ffcd44d7e6c46704f8af0321d9314cd26e0e18a.patch:-p1 \
-#		0e1a49c8907645d2e155f0d89d4d9895ac5112b5.patch:-p1 \
-#		50f06b3efb638efb0abd95dc62dca05ae67882c2.patch:-p1 \
-#		edc7b6abb0c125eeb888748c334897f60aab0854.patch:-p1
-
 MAINTAINER?=	desktop@FreeBSD.org
 COMMENT?=	XML parser library for GNOME
 

textproc/libxml2/files/patch-git-106757e8c1e26ad9b8c924c7f304074b79e082c5

@@ -0,0 +1,39 @@
+commit 106757e8c1e26ad9b8c924c7f304074b79e082c5
+Author: Daniel Cheng <dcheng@google.com>
+Date:   Fri Apr 10 14:52:03 2020 -0700
+
+    Guard new calls to xmlValidatePopElement in xml_reader.c
+    
+    Closes #154.
+
+commit 386fb27654b93d9fb2880e03fb508d618a2e66f1
+Author: Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
+Date:   Tue Apr 28 17:00:37 2020 +0200
+
+    Add LIBXML_VALID_ENABLED to xmlreader
+    
+    There are already LIBXML_VALID_ENABLED in this file to guard against
+    "--without-valid" at "./configure" step, but here they were missing.
+diff --git xmlreader.c xmlreader.c
+index 687c8b3c..3fd9aa4c 100644
+--- xmlreader.c
++++ xmlreader.c
+@@ -2260,14 +2260,18 @@ xmlFreeTextReader(xmlTextReaderPtr reader) {
+     if (reader->ctxt != NULL) {
+         if (reader->dict == reader->ctxt->dict)
+ 	    reader->dict = NULL;
++#ifdef LIBXML_VALID_ENABLED
+ 	if ((reader->ctxt->vctxt.vstateTab != NULL) &&
+ 	    (reader->ctxt->vctxt.vstateMax > 0)){
++#ifdef LIBXML_REGEXP_ENABLED
+             while (reader->ctxt->vctxt.vstateNr > 0)
+                 xmlValidatePopElement(&reader->ctxt->vctxt, NULL, NULL, NULL);
++#endif /* LIBXML_REGEXP_ENABLED */
+ 	    xmlFree(reader->ctxt->vctxt.vstateTab);
+ 	    reader->ctxt->vctxt.vstateTab = NULL;
+ 	    reader->ctxt->vctxt.vstateMax = 0;
+ 	}
++#endif /* LIBXML_VALID_ENABLED */
+ 	if (reader->ctxt->myDoc != NULL) {
+ 	    if (reader->preserve == 0)
+ 		xmlTextReaderFreeDoc(reader, reader->ctxt->myDoc);