FS-7519: add missing deps

src/mod/applications/mod_av/Makefile.am

@@ -5,4 +5,5 @@ mod_LTLIBRARIES = mod_av.la
 mod_av_la_SOURCES  = mod_av.c
 mod_av_la_CFLAGS   = $(AM_CFLAGS)
 mod_av_la_LIBADD   = $(switch_builddir)/libfreeswitch.la
-mod_av_la_LDFLAGS  = -avoid-version -module -no-undefined -shared -lavformat -lavcodec
+mod_av_la_LDFLAGS  = -avoid-version -module -no-undefined -shared -lavformat -lavcodec -lavutil -lx264
+