annotate-blame test: don't "source", but say "."

Just I am old fashioned.  Source inclusion in bourne shell is
"." (dot), not "source" -- that's csh.

[jc: yes I know bash groks it, but I am old fashioned.]

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/t/t8001-annotate.sh b/t/t8001-annotate.sh
index 9e5a04b..2496397 100755
--- a/t/t8001-annotate.sh
+++ b/t/t8001-annotate.sh
@@ -4,6 +4,6 @@
 . ./test-lib.sh
 
 PROG='git annotate'
-source ../annotate-tests.sh
+. ../annotate-tests.sh
 
 test_done
diff --git a/t/t8002-blame.sh b/t/t8002-blame.sh
index 1036c54..9777393 100755
--- a/t/t8002-blame.sh
+++ b/t/t8002-blame.sh
@@ -4,6 +4,6 @@
 . ./test-lib.sh
 
 PROG='git blame -c'
-source ../annotate-tests.sh
+. ../annotate-tests.sh
 
 test_done