Revert "On Linux, define _FILE_OFFSET_BITS to 64 to support large files on"

This reverts commit 55e1bfa3262160ef17dded2a779862f3ffad43b5.

The code uses fts.h, many of which are not ready for _FILE_OFFSET_BITS
and #error out.
diff --git a/cmake-config.h.in b/cmake-config.h.in
index d1eb100..7e252b9 100644
--- a/cmake-config.h.in
+++ b/cmake-config.h.in
@@ -1,10 +1,5 @@
 #ifndef HAD_CONFIG_H
 #define HAD_CONFIG_H
-#if defined(__linux__)
-#ifndef _FILE_OFFSET_BITS
-#define _FILE_OFFSET_BITS 64
-#endif
-#endif
 #ifndef _HAD_ZIPCONF_H
 #include "zipconf.h"
 #endif