[libmariadb] Mark as not supporting static yet

ports/libmariadb/portfile.cmake

@@ -1,4 +1,7 @@
 include(${CMAKE_TRIPLET_FILE})
+if (VCPKG_LIBRARY_LINKAGE STREQUAL static)
+    message(FATAL_ERROR "Static building not supported yet")
+endif()
 include(vcpkg_common_functions)
 set(SOURCE_PATH ${CURRENT_BUILDTREES_DIR}/src/mariadb-connector-c-2.3.1)