MDEV-4425: moving the bundled pcre include directory earlier,

to avoid system *.h files to be included (e.g. like on labrador).

client/CMakeLists.txt

@@ -15,10 +15,10 @@
 
 INCLUDE_DIRECTORIES(
   ${CMAKE_SOURCE_DIR}/include
+  ${CMAKE_SOURCE_DIR}/pcre
   ${ZLIB_INCLUDE_DIR}
   ${SSL_INCLUDE_DIRS}
   ${CMAKE_SOURCE_DIR}/libmysql
-  ${CMAKE_SOURCE_DIR}/pcre
   ${CMAKE_SOURCE_DIR}/sql
   ${CMAKE_SOURCE_DIR}/strings
   ${MY_READLINE_INCLUDE_DIR}