Stop converting relative symlinks to absolute.

There's no reason to make them absolute, simply store in the metadata
the target file as is. This vastly simplifies the code and makes all
test pass correctly.

include/xbps.h.in

@@ -48,7 +48,7 @@
  *
  * This header documents the full API for the XBPS Library.
  */
-#define XBPS_API_VERSION	"20150219-1"
+#define XBPS_API_VERSION	"20150219-2"
 
 #ifndef XBPS_VERSION
  #define XBPS_VERSION		"UNSET"
@@ -1945,17 +1945,14 @@ char *xbps_pubkey2fp(struct xbps_handle *xhp, xbps_data_t pubkey);
 char *xbps_sanitize_path(const char *src);
 
 /**
- * Returns a sanitized target file of \a path without the rootdir component.
+ * Returns the target file of the symlink \a symlink.
  *
- * @param[in] xhp The pointer to an xbps_handle struct.
- * @param[in] path path component.
- * @param[in] target The stored target file of a symlink.
+ * @param[in] symlink The path to a symlink.
  *
- * @return The sanitized path in a buffer.
+ * @return The target file in a buffer.
  * The returned buffer must be free(3)d when it's no longer necessary.
  */
-char *xbps_symlink_target(struct xbps_handle *xhp, const char *path,
-		const char *target);
+char *xbps_symlink_target(const char *symlink);
 
 /*@}*/