MDEV-21942 Building 10.5 requires Internet access

Force correct PCRE2 linking in the official binaries.
System pcre2 in RPM/DEB, bundled in bintars.

cmake/build_configurations/mysql_release.cmake

@@ -96,6 +96,8 @@ ELSEIF(RPM)
   SET(SEMODULE_PACKAGE /usr/bin/semodule_package CACHE FILEPATH "")
   SET(PLUGIN_AUTH_SOCKET YES CACHE STRING "")
   SET(WITH_EMBEDDED_SERVER ON CACHE BOOL "")
+  # not yet, SLES 12.3 doesn't provide pcre2
+  #SET(WITH_PCRE system CACHE STRING "")
 ELSEIF(DEB)
   SET(WITH_SSL system CACHE STRING "")
   SET(WITH_ZLIB system CACHE STRING "")
@@ -103,12 +105,14 @@ ELSEIF(DEB)
   SET(HAVE_EMBEDDED_PRIVILEGE_CONTROL ON)
   SET(PLUGIN_AUTH_SOCKET YES CACHE STRING "")
   SET(WITH_EMBEDDED_SERVER ON CACHE BOOL "")
+  SET(WITH_PCRE system CACHE STRING "")
 ELSE()
   SET(WITH_SSL bundled CACHE STRING "")
   SET(WITH_ZLIB bundled CACHE STRING "")
   SET(WITH_JEMALLOC static CACHE STRING "")
   SET(PLUGIN_AUTH_SOCKET STATIC CACHE STRING "")
   SET(WITH_STRIPPED_CLIENT ON CACHE BOOL "Strip all client binaries")
+  SET(WITH_PCRE bundled CACHE STRING "")
 ENDIF()
 
 IF(NOT COMPILATION_COMMENT)