Fix timezone of yesterday

Set the `TZ environment variable.  `git log` does not recognize UTC
offset in `--before` option, unless full datetime is given.

Author: nobu

template/Makefile.in

@@ -748,4 +748,4 @@ yes-test-syntax-suggest: $(PREPARE_SYNTAX_SUGGEST)
 no-test-syntax-suggest:
 
 yesterday:
-	$(GIT_IN_SRC) reset --hard `$(GIT_LOG_FORMAT):%H -1 --before=00:00+0900`
+	$(GIT_IN_SRC) reset --hard `TZ=UTC-9 $(GIT_LOG_FORMAT):%H -1 --before=00:00`

win32/Makefile.sub

@@ -1391,6 +1391,7 @@ rubyspec-capiext: $(RUBYSPEC_CAPIEXT_EXTS)
 exts: rubyspec-capiext
 
 yesterday:
+	(set TZ=UTC-9) && \
 	for /f "usebackq" %H in \
-	    (`$(GIT_LOG_FORMAT):%H -1 "--before=00:00+0900"`) do \
+	    (`$(GIT_LOG_FORMAT):%H -1 "--before=00:00"`) do \
 	    $(GIT_IN_SRC) reset --hard %%H