Merge branch 'rj/build-tweaks-part2'

Updates to meson-based build procedure. * rj/build-tweaks-part2: configure.ac: upgrade to a compilation check for sysinfo meson.build: correct setting of GIT_EXEC_PATH meson: correct path to system config/attribute files meson: correct install location of YAML.pm meson.build: quote the GITWEBDIR build configuration