t/t9001-send-email.sh: ensure generated script is executed with $SHELL_PATH

If the shell is not specified using the '#!' notation, then the OS will
use '/bin/sh' to execute the script which may not produce the desired
results.  In particular, /bin/sh on Solaris interprets '^' specially which
has an effect on the sed command that this patch touches.

Signed-off-by: Brandon Casey <drafnel@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index fb7d9f3..fb606a9 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -152,7 +152,10 @@
 	clean_fake_sendmail &&
 	cp $patches cccmd.patch &&
 	echo cccmd--cccmd@example.com >>cccmd.patch &&
-	echo sed -n s/^cccmd--//p \"\$1\" > cccmd-sed &&
+	{
+	  echo "#!$SHELL_PATH"
+	  echo sed -n -e s/^cccmd--//p \"\$1\"
+	} > cccmd-sed &&
 	chmod +x cccmd-sed &&
 	git send-email \
 		--from="Example <nobody@example.com>" \