Remove ECHO. I'm not sure if it was for debugging or not, but the list

of all actions that jam could possibly execute is not good-looking. E.g:

    gcc.compile
    gcc.link-dll
    gcc.compile
    gcc.link
    ...found 19 targets...
    ...updating 9 targets...
    MkDir1 app/bin/gcc
    MkDir1 app/bin/gcc/debug
    MkDir1 app/bin/gcc/debug/main-target-app
    compile app/bin/gcc/debug/main-target-app/app.o


[SVN r18418]

tools/build

@@ -1 +1 @@
-Subproject commit 5b0b2ceb77193475a904c88bbf668169b19cf4eb
+Subproject commit bf2a14940a58077ae47fe706b50145b69e617988