configure: Promote SQLite3 "not installed" warning to error

Since Asterisk won't build without the library, not having it is definitely
an error. Thanks to Kyle Kurz for pointing this out.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@432280 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure.ac

@@ -2154,8 +2154,8 @@ AST_EXT_LIB_CHECK([SQLITE], [sqlite], [sqlite_exec], [sqlite.h])
 AST_EXT_LIB_CHECK([SQLITE3], [sqlite3], [sqlite3_open], [sqlite3.h], [${PTHREAD_LIBS}], [${PTHREAD_CFLAGS}])
 
 if test "${PBX_SQLITE3}" != 1; then
-	AC_MSG_WARN(*** Asterisk now uses SQLite3 for the internal Asterisk database.)
-	AC_MSG_WARN(*** Please install the SQLite3 development package.)
+	AC_MSG_ERROR(*** Asterisk now uses SQLite3 for the internal Asterisk database.)
+	AC_MSG_ERROR(*** Please install the SQLite3 development package.)
 	exit 1
 fi