Previously, I was trying to be a good citizen and let ripgrep use the
system libc. But it turns out that building ripgrep on Arch with a newer
version of glibc than what is in Ubuntu results in the whole thing
breaking. Arguably, I should build the Debian artifact on an Ubuntu or
Debian machine of an appropriate version, but that's too much work. If
people really want that, then they can install some ancient version of
ripgrep from their Ubuntu/Debian repo.
Since we were already statically linking PCRE2, we go the whole nine
yards and statically link the entire thing.
Fixes#1890
If ripgrep hasn't been built yet (i.e. target/debug/ doesn't exist),
then cargo-out-dir can't find OUT_DIR and the copy commands fail. Fix by
running cargo build before finding OUT_DIR.
Also add a check to fail early with a sensible error message when
asciidoctor isn't installed, rather than failing because of a missing
rg.1 file after the build.
PR #1831
