fontconfig: disable tests

The tests require json-c library which is not explicit in build
dependencies:

../sources/fontconfig-2.17.1/test/test-conf.c:27:10: fatal error:
json.h: No such file or directory
   27 | #include <json.h>

The tests are not used so just disable them.

(From OE-Core rev: 0d039d959c51f3402631014139c4d6208416b1b7)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/fontconfig/fontconfig_2.17.1.bb

@@ -65,6 +65,12 @@ FONTCONFIG_CACHE_DIR ?= "${localstatedir}/cache/fontconfig"
 # /usr/share/fonts is already included by default (you can change it with --with-default-fonts)
 FONTCONFIG_FONT_DIRS ?= "no"
 
-EXTRA_OEMESON = " -Ddoc=disabled -Ddefault-fonts-dirs=${datadir}/fonts -Dcache-dir=${FONTCONFIG_CACHE_DIR} -Dadditional-fonts-dirs=${FONTCONFIG_FONT_DIRS}"
+EXTRA_OEMESON = "\
+    -Dadditional-fonts-dirs=${FONTCONFIG_FONT_DIRS} \
+    -Dcache-dir=${FONTCONFIG_CACHE_DIR} \
+    -Ddefault-fonts-dirs=${datadir}/fonts \
+    -Ddoc=disabled \
+    -Dtests=disabled \
+"
 
 BBCLASSEXTEND = "native nativesdk"