Move version files out of extern folder

The folder extern is reserved for external contributions, not common
files.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

src/link/main.c

@@ -13,7 +13,6 @@
 #include <unistd.h>
 
 #include "extern/err.h"
-#include "extern/version.h"
 
 #include "link/object.h"
 #include "link/output.h"
@@ -24,6 +23,8 @@
 #include "link/main.h"
 #include "link/library.h"
 
+#include "version.h"
+
 enum eBlockType {
 	BLOCK_COMMENT,
 	BLOCK_OBJECTS,