Merge branch 'ps/build-meson-fixes-0130'

Assorted fixes and improvements to the build procedure based on meson. * ps/build-meson-fixes-0130: gitlab-ci: restrict maximum number of link jobs on Windows meson: consistently use custom program paths to resolve programs meson: fix overwritten `git` variable meson: prevent finding sed(1) in a loop meson: improve handling of `sane_tool_path` option meson: improve PATH handling meson: drop separate version library meson: stop linking libcurl into all executables meson: introduce `libgit_curl` dependency meson: simplify use of the common-main library meson: inline the static 'git' library meson: fix OpenSSL fallback when not explicitly required meson: fix exec path with enabled runtime prefix