Makefile: fetch git tarballs from http://hjemli.net/git/git/

The git tarballs are currently not available from kernel.org, so for now
the makefile will download autogenerated tarballs from cgit.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

Makefile

@@ -13,7 +13,7 @@ pdfdir = $(docdir)
 mandir = $(prefix)/share/man
 SHA1_HEADER = <openssl/sha.h>
 GIT_VER = 1.7.4
-GIT_URL = http://www.kernel.org/pub/software/scm/git/git-$(GIT_VER).tar.bz2
+GIT_URL = http://hjemli.net/git/git/snapshot/git-$(GIT_VER).tar.bz2
 INSTALL = install
 MAN5_TXT = $(wildcard *.5.txt)
 MAN_TXT  = $(MAN5_TXT)