specify the location of pcre.h that is used in some header files in MariaDB 10.0.5.

component/mariadb/buildout.cfg

@@ -74,6 +74,6 @@ depends =
   ${groonga-normalizer-mysql:version}
 environment =
   PATH=${groonga:location}/bin:${pkgconfig:location}/bin:%(PATH)s
-  CPPFLAGS=-I${groonga:location}/include/groonga
+  CPPFLAGS=-I${groonga:location}/include/groonga -I${mariadb:location}__compile__/mariadb-${mariadb:version}/pcre
   LDFLAGS=-L${groonga:location}/lib
   PKG_CONFIG_PATH=${groonga:location}/lib/pkgconfig:${groonga-normalizer-mysql:location}/lib/pkgconfig