Made the kernel generate-config "build as modules as you can" an option.

Sepcifically, a nixpkgs "platform" option. So, for PC all remained the same
as it was.

svn path=/nixpkgs/trunk/; revision=20059

pkgs/os-specific/linux/kernel/generate-config.pl

@@ -13,6 +13,7 @@ use strict;
 use IPC::Open2;
 
 my $debug = $ENV{'DEBUG'};
+my $autoModules = $ENV{'AUTO_MODULES'};
     
 $SIG{PIPE} = 'IGNORE';
 
@@ -69,7 +70,7 @@ sub runConfig {
                 my $question = $1; my $name = $2; my $alts = $3;
                 my $answer = "";
                 # Build everything as a module if possible.
-                $answer = "m" if $alts =~ /\/m/;
+                $answer = "m" if $autoModules && $alts =~ /\/m/;
                 $answer = $answers{$name} if defined $answers{$name};
                 print STDERR "QUESTION: $question, NAME: $name, ALTS: $alts, ANSWER: $answer\n" if $debug;
                 print OUT "$answer\n";