Rename default options path from "build_options/default" to "default_options",

and current options path from "build_options/current" to "options".
This way we can symlink default_options to a different build dir
w/o clobbering the current options.

--HG--
rename : build/build_options/default/ALPHA_FS => build/default_options/ALPHA_FS
rename : build/build_options/default/ALPHA_FS_TL => build/default_options/ALPHA_FS_TL
rename : build/build_options/default/ALPHA_SE => build/default_options/ALPHA_SE
rename : build/build_options/default/MIPS_SE => build/default_options/MIPS_SE
rename : build/build_options/default/SPARC_SE => build/default_options/SPARC_SE
extra : convert_revision : 8c0d3139cdd7e9ed40a9f2deeb47f65f24e52799

build/SConstruct

@@ -341,11 +341,11 @@ for build_dir in build_dirs:
     sticky_opts.files = []
     # Name of default options file is taken from 'default=' on command
     # line if set, otherwise name of build dir.
-    default_options_file = os.path.join('build_options', 'default',
+    default_options_file = os.path.join('default_options',
                                         ARGUMENTS.get('default', build_dir))
     if os.path.isfile(default_options_file):
         sticky_opts.files.append(default_options_file)
-    current_options_file = os.path.join('build_options', 'current', build_dir)
+    current_options_file = os.path.join('options', build_dir)
     if os.path.isfile(current_options_file):
         sticky_opts.files.append(current_options_file)
     else:
@@ -355,7 +355,7 @@ for build_dir in build_dirs:
         if not os.path.isdir(opt_dir):
             os.mkdir(opt_dir)
     if not sticky_opts.files:
-        print "%s: No options file found in build_options, using defaults." \
+        print "%s: No options file found in options, using defaults." \
               % build_dir
 
     # Apply current option settings to env