Remove unused awk-translation of OS name.

src/sbbs3/GNUmakefile

@@ -63,7 +63,6 @@ ifndef os
 endif
 # this line wont work with solaris unless awk in path is actually gawk 
 os      :=	$(shell echo $(os) | tr "[A-Z]" "[a-z]")
-#os      :=	$(shell echo $(os) | awk '/.*/ { print tolower($$1)}')
 # remove '/' from "os/2"
 os      :=  $(shell echo $(os) | tr -d "/")