Merge pull request #573 from micmac1/span3xml2-1907

[19.07] spandsp3: prevent host include search paths

libs/spandsp3/Makefile

@@ -13,7 +13,7 @@ PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/freeswitch/spandsp.git
 PKG_SOURCE_DATE=2020-08-14
 PKG_SOURCE_VERSION:=6ec23e5a7e411a22d59e5678d12c4d2942c4a4b6
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_MIRROR_HASH:=fcfa13576a25ff27e3746c3db30de89d2afceb963072b352a34e7a4a9f492ae5
 
 PKG_INSTALL:=1

libs/spandsp3/patches/02-do-not-check-for-libxml2.patch

@@ -0,0 +1,20 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -231,6 +231,9 @@ then
+     AC_CHECK_HEADERS([X11/X.h])
+ fi
+ 
++# Note: the libxml2 checks below introduce host include paths into the
++# build, so we turn them off.
++if test -n "$enable_tests" ; then # OpenWrt doesn't build the tests
+ # Determine XML2 include path
+ AC_MSG_CHECKING(for libxml/xmlmemory.h)
+ 
+@@ -259,6 +262,7 @@ fi
+ AC_CHECK_HEADERS([libxml/xmlmemory.h])
+ AC_CHECK_HEADERS([libxml/parser.h])
+ AC_CHECK_HEADERS([libxml/xinclude.h])
++fi # OpenWrt doesn't build the tests
+ 
+ AC_LANG([C++])
+ AC_CHECK_HEADERS([FL/Fl.H])