graphviz: Disable perl support

It ends up peeking into build host's perl installation under /usr/include
for perl.h which infact is incorrect. Its better to either fix it to
know cross-compiling or disable it, for now chose the latter.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-graphics/graphviz/graphviz_12.1.2.bb

@@ -38,6 +38,7 @@ EXTRA_OECONF:class-target = "\
                 --with-expatlibdir=${STAGING_LIBDIR} \
                 --without-included-ltdl \
                 --disable-java \
+                --disable-perl \
                 --disable-tcl \
                 --disable-r \
                 --disable-sharp \