Document accumulated fixes since 1.7.9.2

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.7.9.3.txt

+Git v1.7.9.3 Release Notes
+==========================
+
+Fixes since v1.7.9.2
+--------------------
+
+ * "git p4" (in contrib/) submit the changes to a wrong place when the
+   "--use-client-spec" option is set.
+
+ * The config.mak.autogen generated by optional autoconf support tried
+   to link the binary with -lintl even when libintl.h is missing from
+   the system.
+
+ * "git add --refresh <pathspec>" used to warn about unmerged paths
+   outside the given pathspec.
+
+Also contains minor fixes and documentation updates.

RelNotes

-Documentation/RelNotes/1.7.9.2.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.9.3.txt
\ No newline at end of file