main/linux-grsec: add sed to makedepends

Got the following build error (musl libc):

arch/x86/boot/header.S:425: Error: can't resolve `VO__end' {*UND* section}
  - `VO__text' {*UND* section}

Internet says this is fixed by using GNU sed, and so it was.
main/gtk+3.0: upgrade to 3.10.1
main/lua-lgi: add lua 5.2 support
main/xbc-util-cursor: new aport
main/awesome: upgrade to 3.5.2
main/libxkbcommon: upgrade to 0.3.1
main/weechat: upgrade to 0.4.2
main/xkeyboard-config: upgrade to 2.10.1
main/mercurial: upgrade to 2.7.2
main/xcb-util-cursor: build fix
main/cups: upgrade to 1.6.4
main/fping: upgrade to 3.6
main/findutils: fix musl build
main/findutils: add missing patch
main/vte3: fix musl build
main/gst-libav1: fix musl build
main/lua-stdlib: add lua to makedepends
main/musl: add missing enums and functions for compatibility
main/keyutils: fix musl build
main/krb5: fix musl build