Make t8001-annotate and t8002-blame more portable

These two tests assume that "sed" will not modify the final line of a
stream if it does not end with a newline character.  The assumption is
not true at least for FreeBSD and Solaris 9.  FreeBSD's "sed" appends
a newline character; "sed" in Solaris 9 even removes the incomplete
final line.  This patch makes the test use perl instead.
Signed-off-by: NDennis Stosberg <dennis@stosberg.net>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

t/annotate-tests.sh

@@ -111,9 +111,7 @@ test_expect_success \
 
 test_expect_success \
     'some edit' \
-    'mv file file1 &&
-     sed -e 1d -e "5s/3A/99/" file1 >file &&
-     rm -f file1 &&
+    'perl -pi -e "s/^1A.*\n$//; s/^3A/99/" file &&
     GIT_AUTHOR_NAME="D" git commit -a -m "edit"'
 
 test_expect_success \