scons: Add a few more human friendly messages.

scons/custom.py

@@ -59,6 +59,7 @@ def quietCommandLines(env):
     env['LEXCOMSTR'] = "  Generating $TARGET ..."
     env['YACCCOMSTR'] = "  Generating $TARGET ..."
     env['CODEGENCOMSTR'] = "  Generating $TARGET ..."
+    env['INSTALLSTR'] = "  Installing $TARGET ..."
 
 
 def createConvenienceLibBuilder(env):

scons/gallium.py

@@ -74,7 +74,7 @@ def install_shared_library(env, sources, version = ()):
             while len(version):
                 version = version[:-1]
                 target_name = '.'.join((str(source),) + version)
-                action = SCons.Action.Action(symlink, "$TARGET -> $SOURCE")
+                action = SCons.Action.Action(symlink, "  Symlinking $TARGET ...")
                 last = env.Command(os.path.join(target_dir, target_name), last, action) 
                 targets += last
     return targets