python3: add override for uuid.h header check

Signed-off-by: Martin Strobel <arctus@crza.de>

lang/python/python3/files/config.site

@@ -9,4 +9,5 @@
 ac_cv_file__dev_ptmx=yes
 ac_cv_file__dev_ptc=no
 ac_cv_buggy_getaddrinfo=no
+ac_cv_header_uuid_h=yes