Don't require pkg-config when building from repository.
* INSTALL: Prefer './configure FOO=BAR' to 'FOO=BAR ./configure'. * INSTALL.REPO: pkg-config is no longer required to build from the repository. * autogen.sh: Don't check for pkg-config. (progs): Remove pkg-config. (pkg_config_min, AUTORECONF_ENV, env_space, ACLOCAL_PATH): Remove. All uses removed. * m4/pkg.m4: New file, built by admin/merge-pkg-config. * configure.ac: Remove unnecessary m4_pattern_forbid of ^PKG_ and an AC_ARG_VAR of PKG_CONFIG_PATH. pkg.m4 does that for us. (EMACS_CHECK_MODULES): Remove workaround for old pkg-config bug, as we use pkg.m4 from a newer pkg-config. * admin/merge-pkg-config: New script. * admin/notes/copyright: Update for m4/*.m4, in particular m4/pkg.m4. * etc/NEWS: Prefer './configure FOO=BAR' to 'FOO=BAR ./configure'. * etc/PROBLEMS (Build-time-problems): Remove pkg-config problem that is no longer an issue. * nt/INSTALL: Remove no-longer-needed notes about pkg-config.
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