Minor improvements and fixes in tests `depcomp*.test'. * tests/depcomp.test: Do not create useless dummy source files. Add a trailing `:' command. * tests/depcomp2.test: Use `unset' on the CFLAG variable to ensure it's not in in the environment, rather tthan exporting it with an empty value. Do not pass CC=gcc to configure, as that's already done in ./defs since we have gcc in $required. Ensure verbose printing of captured stderr, and normalize its checking. Add a trailing `:' command. * tests/depcomp3.test: Quote literal dots and dollar characters in grep regexps. Always use `: >' rather than `touch' to create empty files. Explicitly declare phony targets as such in the created Makefile.am. Add a trailing `:' command. * tests/depcomp4.test: Quote literal dots and dollar characters in grep regexp. Explicitly declare phony targets as such in the created Makefile.am. Ensure verbose printing of captured makes' stoud/stderr. Add a trailing `:' command. * tests/depcomp5.test: Move setting of `errexit' shell flag earlier in the script (just after inclusion of ./defs). Quote literal dots and dollar characters in grep regexps. Explicitly declare phony targets as such in the created Makefile.am. Add a trailing `:' command. * tests/depcomp6.test: Consistenty use m4 quoting in the generated configure.in. Cosmetic fixes to spacing. Make the "dummy" `if' statement required by OpenBSD's sh `set -e' more robust, and add explanatory comments to it. * tests/depcomp7.test: Likewise, and add a trailing `:' command.