Fix python binary name in arch/SConscript.

Also delete no-longer-needed SPARC test.py files (should
have gone with my last chnageset where LiveProcess
became ISA-independent).

src/arch/SConscript:
    Mistakenly committed hard-coded python binary name.
    Should use same python to run isa_parser that was
    used to run scons.

--HG--
extra : convert_revision : a3acd5496f3b930d57bb59ae164b8a4a8065bbf8

src/arch/SConscript

@@ -28,7 +28,7 @@
 #
 # Authors: Steve Reinhardt
 
-import os.path
+import os.path, sys
 
 # Import build environment variable from SConstruct.
 Import('env')
@@ -134,7 +134,8 @@ def isa_desc_emitter(target, source, env):
     return (isa_desc_gen_files, [isa_parser, cpu_models_file] + source)
 
 # Pieces are in place, so create the builder.
-isa_desc_builder = Builder(action='python2.4 $SOURCES $TARGET.dir $CPU_MODELS',
+python = sys.executable  # use same Python binary used to run scons
+isa_desc_builder = Builder(action=python + ' $SOURCES $TARGET.dir $CPU_MODELS',
                            emitter = isa_desc_emitter)
 
 env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })