gawk: No longer prevent nawk from being active

The nawk port was broken, but was fixed some time ago.

Also add size to checksums.

lang/gawk/Portfile

@@ -1,7 +1,6 @@
 # -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
 
 PortSystem              1.0
-PortGroup               conflicts_build 1.0
 
 name                    gawk
 version                 4.2.1
@@ -21,13 +20,12 @@ long_description \
     just a few lines of code. It is a free, extended version of awk.
 
 checksums               rmd160  4a7a4ddccb871626d8c3ec3019de65c47b71fb29 \
-                        sha256  d1119785e746d46a8209d28b2de404a57f983aa48670f4e225531d3bdc175551
+                        sha256  d1119785e746d46a8209d28b2de404a57f983aa48670f4e225531d3bdc175551 \
+                        size    2985412
 
 depends_lib             port:gettext \
                         port:readline
 
-conflicts_build         nawk
-
 configure.args          --with-libiconv-prefix=${prefix} \
                         --without-mpfr \
                         ac_cv_libsigsegv=no \