Round 1 of IMAP_STORAGE-related app_voicemail changes

This makes IMAP_STORAGE include the proper headers if you
have specified the "system" option for --with-imap when running
the configure script and your IMAP-related headers exist in 
/usr/include/c-client.

This change is due to a hasty merge of a 1.4 change I made.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@114575 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -75,6 +75,10 @@ c-client (http://www.washington.edu/imap/
 #include <imap/c-client.h>
 #include <imap/imap4r1.h>
 #include <imap/linkage.h>
+#elif defined (USE_SYSTEM_CCLIENT)
+#include <c-client/c-client.h>
+#include <c-client/imap4r1.h>
+#include <c-client/linkage.h>
 #else
 #include "c-client.h"
 #include "imap4r1.h"
@@ -5549,6 +5553,8 @@ static int init_mailstream(struct vm_state *vms, int box)
 		char *cp;
 #ifdef USE_SYSTEM_IMAP
 #include <imap/linkage.c>
+#elif defined(USE_SYSTEM_CCLIENT)
+#include <c-client/linkage.c>
 #else
 #include "linkage.c"
 #endif