added mutable keyword to gints used in glib atomic operations to satisfy compiler on PPC arch. Also moved the needed apple ldflags for making shared libs to a better place.

git-svn-id: svn://localhost/ardour2/trunk@579 d708f5d6-7413-0410-9779-e7cbd77b26cf

SConstruct

@@ -736,6 +736,12 @@ if env['FPU_OPTIMIZATION']:
             print "\nWarning: you are building Ardour with SSE support even though your system does not support these instructions. (This may not be an error, especially if you are a package maintainer)"
 # end optimization section
 
+#
+# save off guessed arch element in an env
+#
+env.Append(CONFIG_ARCH=config[config_arch])
+
+
 #
 # ARCH="..." overrides all 
 #