MDEV-33091 pcre2 headers - handle columnstore

From e735cf2ed7cefb2af36f10f3cb47dfc060789df3, the PCRE_INCLUDES
changed to PCRE_INCLUDE_DIRS for consistency.

The columnstore module depends on the old name.

Create a mapping for the columnstore submodule.

10.6+ fix for submodule is:
* https://github.com/mariadb-corporation/mariadb-columnstore-engine/pull/3304

storage/columnstore/CMakeLists.txt

@@ -21,6 +21,7 @@ CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64")
         return()
     ENDIF()
 
+    SET(PCRE_INCLUDES "${PCRE_INCLUDE_DIRS}")
     add_subdirectory(columnstore)
 
     IF(TARGET columnstore)