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git: utilize time zone info when present and ignore it when it's not

This fixes a bug which prevents us from modifying some
real-world repositories (test case: KnightOS), and utilizes
time zone information when it's present to improve our timestamps.

--- a/sys/src/cmd/git/pack.c

+++ b/sys/src/cmd/git/pack.c

@@ -825,6 +825,7 @@

 {

 	char buf[128];

 	Resub m[4];

+	vlong tz;

 	char *p;

 	int n, nm;

@@ -845,10 +846,16 @@

 	memcpy(*name, m[1].sp, nm);

 	buf[nm] = 0;

+	nm = m[3].ep - m[3].sp;

+	memcpy(buf, m[3].sp, nm);

+	buf[nm] = 0;

+	tz = atoll(buf);

+

 	nm = m[2].ep - m[2].sp;

 	memcpy(buf, m[2].sp, nm);

 	buf[nm] = 0;

-	*time = atoll(buf);

+	*time = atoll(buf) + 3600*(tz/100) + 60*(tz%100);

+

 	return 0;

 }

--- a/sys/src/cmd/git/util.c

+++ b/sys/src/cmd/git/util.c

@@ -207,7 +207,7 @@

 	fmtinstall('Q', Qfmt);

 	inflateinit();

 	deflateinit();

-	authorpat = regcomp("[\t ]*(.*)[\t ]+([0-9]+)[\t ]+([\\-+]?[0-9]+)");

+	authorpat = regcomp("[\t ]*(.*)[\t ]+([0-9]+)[\t ]*([\\-+]?[0-9]+)?");

 	osinit(&objcache);

 }