Use intptr_t instead of off_t inside FcCache structure.

This avoids OS-dependencies in the cache file structure.

src/fcint.h

@@ -308,7 +308,7 @@ typedef struct _FcStrBuf {
 
 typedef struct _FcCache {
     int		magic;              /* FC_CACHE_MAGIC */
-    off_t	size;		    /* size of file */
+    intptr_t	size;		    /* size of file */
     intptr_t	dir;		    /* offset to dir name */
     intptr_t	dirs;		    /* offset to subdirs */
     int		dirs_count;	    /* number of subdir strings */

src/fcserialize.c

@@ -26,7 +26,6 @@ typedef union _FcAlign {
     double	d;
     int		i;
     intptr_t	ip;
-    off_t	o;
     FcBool	b;
     void	*p;
 } FcAlign;