meson.build: remove explicit `install_dir`
Executables are installed in the bindir by default. And
furthermore if the directory is explicitly specified, then
the target won't be considered when setting up $PATH in the devenv.
Fixes 1ef43a52Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Executables are installed in the bindir by default. And
furthermore if the directory is explicitly specified, then
the target won't be considered when setting up $PATH in the devenv.
Fixes 1ef43a52