Get rid of assumptions about ".nexe" extension.

tests/stubout_mode/nacl.scons

Index: tests/stubout_mode/nacl.scons
===================================================================
--- tests/stubout_mode/nacl.scons	(revision 5777)
+++ tests/stubout_mode/nacl.scons	(working copy)
@@ -20,12 +20,12 @@
 stubout_tool = env['TRUSTED_ENV'].File(
     '${STAGING_DIR}/${PROGPREFIX}ncval_stubout${PROGSUFFIX}')
 
-env.ComponentProgram('partly_invalid.nexe', 'partly_invalid.c')
+partly_invalid_nexe = env.ComponentProgram('partly_invalid', 'partly_invalid.c')
+partly_invalid_stubout_nexe = env.File('partly_invalid_stubout${PROGSUFFIX}')
 
 node = env.Command(
-    target='partly_invalid_stubout.nexe',
-    source=[stubout_tool,
-            env.File('partly_invalid.nexe')],
+    target=partly_invalid_stubout_nexe,
+    source=[stubout_tool, partly_invalid_nexe],
     action=[Action('${SOURCES[0]} ${SOURCES[1]} -o $TARGET')])
 # This alias is to ensure this test works with built_elsewhere=1,
 # because with that option CommandSelLdrTestNacl() assumes all its
@@ -37,18 +37,18 @@
 
 # Without any debug flags, the executable fails validation.
 nodes.append(env.CommandSelLdrTestNacl(
-        'partly_invalid_1.out', command=[env.File('partly_invalid.nexe')],
+        'partly_invalid_1.out', partly_invalid_nexe,
         exit_status='1'))
 
 # With "-c", the executable runs to completion but is not safe.
 nodes.append(env.CommandSelLdrTestNacl(
-        'partly_invalid_2.out', command=[env.File('partly_invalid.nexe')],
+        'partly_invalid_2.out', partly_invalid_nexe,
         stdout_golden=env.File('without_stubout.stdout'),
         sel_ldr_flags=['-c']))
 
 # With "-s", the executable runs part way but then faults.
 nodes.append(env.CommandSelLdrTestNacl(
-        'partly_invalid_3.out', command=[env.File('partly_invalid.nexe')],
+        'partly_invalid_3.out', partly_invalid_nexe,
         stdout_golden=env.File('with_stubout.stdout'),
         sel_ldr_flags=['-s'],
         exit_status='untrusted_sigill'))
@@ -57,7 +57,7 @@
 # offline should be equivalent to using sel_ldr's "-s" option.
 nodes.append(env.CommandSelLdrTestNacl(
         'partly_invalid_stubout.out',
-        command=[env.File('partly_invalid_stubout.nexe')],
+        partly_invalid_stubout_nexe,
         stdout_golden=env.File('with_stubout.stdout'),
         exit_status='untrusted_sigill'))