package/mariadb: fix build error with newer cmake

package/mariadb: fix build error with newer cmake

When using a newer host system cmake to build MariaDB, the following build
error occurs:

    CMake Error at cmake/os/Linux.cmake:29 (STRING):
    STRING sub-command REPLACE requires at least four arguments.
    Call Stack (most recent call first):
    CMakeLists.txt:101 (INCLUDE)

    CMake Error at cmake/os/Linux.cmake:29 (STRING):
    STRING sub-command REPLACE requires at least four arguments.
    Call Stack (most recent call first):
    CMakeLists.txt:101 (INCLUDE)

Fixes: https://bugs.busybox.net/show_bug.cgi?id=11781
Signed-off-by: Ryan Coe <bluemrp9@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>