Fix compiler list generation in smart-build.pl (#3500)

Author: rbuch

smart-build.pl

@@ -402,7 +402,7 @@ sub promptUserYN {
 #================ Choose Compiler =================================
 
 # Lookup list of compilers
-my $cs = `$dirname/build charm++ $arch help 2>&1 | grep "Supported compilers"`;
+my $cs = `$dirname/buildold charm++ $arch help 2>&1 | grep "Supported compilers"`;
 # prune away beginning of the line
 $cs =~ m/Supported compilers: (.*)/;
 $cs = $1;