Inigo Martínez authored Dec 15, 2017 and Thomas Haller committed Dec 16, 2017

`generate-plugin-docs.pl` script which is used to parse
`nm-setting-c*.c` files depends on autotools. This is because it
parses the `Makefile.am` in order to figure out the setting files
it needs to parse.

This patch makes the script independent of autotools by passing
the necessary setting files by command line instead of parsing the
`Makefile.am` file. It also changes the autotools' and meson's
accordingly.