vars/build.vars:gmp{_host,}: updated to v6.1.2.
vars/build.vars:libnettle: updated to v3.4.1 (via Redfoxmoon.)
vars/build.vars:libnettle:${PKG_CONFIGURE_ARGS_EXTRA}: configure w/o --disable-assembler and w/ nettle_cv_asm_underscore=no --disable-static (via Redfoxmoon.)
vars/build.vars:libnettle:${PKG_CFLAGS_CONFIGURE_EXTRA}: configure w/ -std=gnu99 (via Redfoxmoon.)
patches/libnettle-3.4.1.local.patch: updated.
patches/libnettle/nettle-conf-fix.patch: via Redfoxmoon.