tests: put temporary file outside the working directory for test portability test-largefiles-update.t creates temporary file exec-bit.patch inside the working directory for no-execbit platform specific test, but subsequent tests aren't aware of it. On execbit platform, subsequent tests can run successfully, because exec-bit.patch isn't created. But on no-execbit platform, this temporary file makes subsequent tests show "? exec-bit.patch" at each "hg status".

tests: avoid quoting of commit messages for test portability journal extension uses util.shellquote() to record command line, but result of it depends on runtime platform: double quotation is used on Windows and OpenVMS, but single quotation is used otherwise. test-journal-share.t sometimes specifies commit messages including white space on command line. It makes journal output depend on runtime platform, but commit message itself isn't important in this test case.