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

diff --cc meson.build
Simple merge

diff --cc meson_options.txt
Simple merge

diff --cc perl/Git/SVN/Memoize/meson.build
index 4c589b30c387a7abcdc445689f07d8848a49b6ff,8c2e80d2d261cdf565288890564e7ab5acf11141..d6209dc3bf1e1070cad30a09370a156ba910fbd6
--- 1/perl/Git/SVN/Memoize/meson.build
--- 2/perl/Git/SVN/Memoize/meson.build
+++ b/perl/Git/SVN/Memoize/meson.build
@@@ -3,6 -3,6 +3,6 @@@ test_dependencies += custom_target
    output: 'YAML.pm',
    command: generate_perl_command,
    install: true,
-   install_dir: perllibdir / 'Git/SVN',
 -  install_dir: get_option('datadir') / 'perl5/Git/SVN/Memoize',
++  install_dir: perllibdir / 'Git/SVN/Memoize',
    depends: [git_version_file],
  )