[Buildroot] [git commit branch/2022.02.x] package/clamav: fix libxml2 build

[Buildroot] [git commit branch/2022.02.x] package/clamav: fix libxml2 build

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=bd043900b21f651c6a47db8ffce7a8c10c09ab61
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2022.02.x

Pass ac_cv_path_xmlconfig to fix the following build failure with
libxml2 raised since bump to version 0.102.0 in commit
007f49962a961f96ff87795217758ec3786d03ac and
https://github.com/Cisco-Talos/clamav/commit/083ca38727b0ebd3979cf1ebc7b31148f6d5e7f7:

aarch64-none-linux-gnu-gcc: WARNING: unsafe header/library path used in cross-compilation: '-I/usr/include/libxml2'
In file included from /usr/include/libxml2/libxml/parser.h:810,
                 from others.c:62:
/usr/include/libxml2/libxml/encoding.h:31:10: fatal error: unicode/ucnv.h: No such file or directory
   31 | #include <unicode/ucnv.h>
      |          ^~~~~~~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/5bb3bea6d13ac8d497f6862374d65a59bea7ed09

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit f5e4bb185a2694c180ba1c51efab4e5a6c8b3975)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/clamav/clamav.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/clamav/clamav.mk b/package/clamav/clamav.mk
index cd2d06e6b3..e2ee99d02b 100644
--- a/package/clamav/clamav.mk
+++ b/package/clamav/clamav.mk
@@ -69,6 +69,7 @@ CLAMAV_CONF_OPTS += --without-libjson
 endif
 
 ifeq ($(BR2_PACKAGE_LIBXML2),y)
+CLAMAV_CONF_ENV += ac_cv_path_xmlconfig=$(STAGING_DIR)/usr/bin/xml2-config
 CLAMAV_CONF_OPTS += --with-xml=$(STAGING_DIR)/usr
 CLAMAV_DEPENDENCIES += libxml2
 else
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