Add awk and sed

base/texlive:2018

 FROM archlinux/base
 MAINTAINER Tamas Gal <tgal@km3net.de>
 
- RUN pacman -Sy --noconfirm make grep glibc
+ RUN pacman -Sy --noconfirm make grep glibc awk sed
  RUN pacman -Sy --noconfirm git
  RUN pacman -Sy --noconfirm texlive-most texlive-lang
  RUN pacman -Sy --noconfirm qpdf poppler