Revert "mariadb: Disable TokuDB until build issue with GCC 4.9 has been fixed."

This reverts commit 00ccb27d.

MDEV-6449 was fixed in version 10.0.14
Note however that TokuDB remains automatically disabled when building MariaDB
with GCC < 4.7

For NEO, TokuDB seems to be a better choice than InnoDB.

component/mariadb/buildout.cfg

@@ -47,7 +47,6 @@ configure-options =
   -DCMAKE_C_FLAGS="-I${jemalloc:location}/include -I${libaio:location}/include -I${libxml2:location}/include -I${ncurses:location}/include -I${openssl:location}/include -I${pcre:location}/include -I${readline5:location}/include -I${zlib:location}/include"
   -DCMAKE_CXX_FLAGS="-I${jemalloc:location}/include -I${libaio:location}/include -I${libxml2:location}/include -I${ncurses:location}/include -I${openssl:location}/include -I${pcre:location}/include -I${readline5:location}/include -I${zlib:location}/include"
   -DCMAKE_INSTALL_RPATH=${jemalloc:location}/lib:${libaio:location}/lib:${libxml2:location}/lib:${ncurses:location}/lib:${openssl:location}/lib:${pcre:location}/lib:${readline5:location}/lib:${zlib:location}/lib
-  -DWITHOUT_TOKUDB=true
 environment =
   CMAKE_PROGRAM_PATH=${cmake:location}/bin
   CMAKE_INCLUDE_PATH=${libaio:location}/include:${libaio:location}/include:${libxml2:location}/include:${ncurses:location}/include:${openssl:location}/include:${pcre:location}/include:${readline5:location}/include:${zlib:location}/include