Fix missing x265_api_query definition.

diff -Nuar a/test/module.defs b/test/module.defs
--- a/test/module.defs	2024-02-10 22:22:33.000000000 +0000
+++ b/test/module.defs	2024-02-13 13:56:54.912042304 +0000
@@ -19,6 +19,10 @@
         x264 bluray freetype xml2 bz2 z jansson harfbuzz opus speex lzma dav1d \
         turbojpeg zimg SvtAv1Enc
 
+ifeq (1,$(FEATURE.x265))
+    TEST.GCC.l += x265
+endif
+
 ifeq (,$(filter $(HOST.system),darwin cygwin mingw))
     TEST.GCC.l += fontconfig
 endif