Use GIT-1.7.3

This fixes http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-2542.

Noticed-by: Silvio Cesare <silvio.cesare@gmail.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

Makefile

@@ -5,7 +5,7 @@ CGIT_DATA_PATH = $(CGIT_SCRIPT_PATH)
 CGIT_CONFIG = /etc/cgitrc
 CACHE_ROOT = /var/cache/cgit
 SHA1_HEADER = <openssl/sha.h>
-GIT_VER = 1.6.4.3
+GIT_VER = 1.7.3
 GIT_URL = http://www.kernel.org/pub/software/scm/git/git-$(GIT_VER).tar.bz2
 INSTALL = install
 
@@ -68,7 +68,7 @@ endif
 	$(QUIET_CC)$(CC) -o $*.o -c $(CFLAGS) $<
 
 
-EXTLIBS = git/libgit.a git/xdiff/lib.a -lz -lcrypto
+EXTLIBS = git/libgit.a git/xdiff/lib.a -lz -lcrypto -lpthread
 OBJECTS =
 OBJECTS += cache.o
 OBJECTS += cgit.o