XXX Remove nawk(1)

*** 51,61 ****
                  messages.po $(TEXT_DOMAIN).po > $(POFILE); \
          $(RM) messages.po $(TEXT_DOMAIN).po
  
  BUILDPO.pofiles = \
          $(RM) $(POFILE); \
!         $(NAWK) '\
              FNR == 1            { print "\# Messages from " FILENAME; } \
              /^domain/           { next; } \
              /^msgid/, /^msgstr/ { msg = msg "\n" $$0; \
                                    if ( $$0 !~ /^msgstr/ ) next; \
                                    if (msg in messages) { \
--- 51,61 ----
                  messages.po $(TEXT_DOMAIN).po > $(POFILE); \
          $(RM) messages.po $(TEXT_DOMAIN).po
  
  BUILDPO.pofiles = \
          $(RM) $(POFILE); \
!         $(AWK) '\
              FNR == 1            { print "\# Messages from " FILENAME; } \
              /^domain/           { next; } \
              /^msgid/, /^msgstr/ { msg = msg "\n" $$0; \
                                    if ( $$0 !~ /^msgstr/ ) next; \
                                    if (msg in messages) { \