Bump the cache version to 5

FcPattern isn't compatible to the older.
diff --git a/fontconfig/fontconfig.h b/fontconfig/fontconfig.h
index 85cdd6d..c571e28 100644
--- a/fontconfig/fontconfig.h
+++ b/fontconfig/fontconfig.h
@@ -66,7 +66,7 @@
  * it means multiple copies of the font information.
  */
 
-#define FC_CACHE_VERSION    "4"
+#define FC_CACHE_VERSION    "5"
 
 #define FcTrue		1
 #define FcFalse		0
diff --git a/src/fcint.h b/src/fcint.h
index 45dfc6e..80205c9 100644
--- a/src/fcint.h
+++ b/src/fcint.h
@@ -470,7 +470,7 @@
 
 #define FC_CACHE_MAGIC_MMAP	    0xFC02FC04
 #define FC_CACHE_MAGIC_ALLOC	    0xFC02FC05
-#define FC_CACHE_CONTENT_VERSION    4
+#define FC_CACHE_CONTENT_VERSION    5
 
 struct _FcAtomic {
     FcChar8	*file;		/* original file name */