standard filter supports multiple line expressions; better amd64 detection for mac os X

tools/buildsh.tmpl

@@ -1,6 +1,8 @@
 #! stdtmpl(subsChar='?') | standard
 #proc GenerateBuildShellScript(c: TConfigData): string = 
-#  result = "#! /bin/sh\n# Generated by niminst\n"
+#  result = "#! /bin/sh\n# Generated from niminst\n" &
+#           "# Template is in tools/buildsh.tmpl\n" &
+#           "# To regenerate run ``niminst csource`` or ``koch csource``\n"
 CC="gcc"
 LINKER="gcc"
 COMP_FLAGS="-w -O3 -fno-strict-aliasing"
@@ -33,7 +35,7 @@ case $uos in
   *darwin* ) 
     myos="macosx"
     LINK_FLAGS="$LINK_FLAGS -ldl -lm"
-    if [ "`sysctl hw |grep 64bit`" = "hw.cpu64bit_capable: 1" ] ; then
+    if [ "$HOSTTYPE" = "x86_64" ] ; then
       ucpu="amd64"
     fi
     ;;