git: update to 1.8.4

No code changes required, just bump the submodule and makefile versions.

Signed-off-by: John Keeping <john@keeping.me.uk>

Makefile

@@ -14,7 +14,7 @@ htmldir = $(docdir)
 pdfdir = $(docdir)
 mandir = $(prefix)/share/man
 SHA1_HEADER = <openssl/sha.h>
-GIT_VER = 1.8.3
+GIT_VER = 1.8.4
 GIT_URL = https://git-core.googlecode.com/files/git-$(GIT_VER).tar.gz
 INSTALL = install
 COPYTREE = cp -r

git

@@ -1 +1 @@
-Subproject commit edca4152560522a431a51fc0a06147fc680b5b18
+Subproject commit e230c568c4b9a991e3175e5f65171a566fd8e39c