Force the locale when executing ld gold

[sylvestre.ledru]

Summary

If run with other locales (like French),
the decode operation might fail

[sylvestre.ledru]

Update another declaration

[• rafael]

LGTM

test/lit.cfg

if (config.host_triple == config.target_triple and
     config.available_features.add("native")
 
 import subprocess
 
 def have_ld_plugin_support():
     if not os.path.exists(os.path.join(config.llvm_shlib_dir, 'LLVMgold.so')):
         return False
 
-    ld_cmd = subprocess.Popen([config.gold_executable, '--help'], stdout = subprocess.PIPE)
+    ld_cmd = subprocess.Popen([config.gold_executable, '--help'], stdout = subprocess.PIPE, env={'LANG': 'C'})
     ld_out = ld_cmd.stdout.read().decode()
     ld_cmd.wait()
 
     if not '-plugin' in ld_out:
         return False
 
     # check that the used emulations are supported.
     emu_line = [l for l in ld_out.split('\n') if 'supported emulations' in l]
     if len(emu_line) != 1:
         return False
     emu_line = emu_line[0]
     fields = emu_line.split(':')
     if len(fields) != 3:
         return False
     emulations = fields[2].split()
     if 'elf_x86_64' not in emulations:
         return False
     if 'elf32ppc' in emulations:
         config.available_features.add('ld_emu_elf32ppc')
 
-    ld_version = subprocess.Popen([config.gold_executable, '--version'], stdout = subprocess.PIPE)
+    ld_version = subprocess.Popen([config.gold_executable, '--version'], stdout = subprocess.PIPE, env={'LANG': 'C'})
     if not 'GNU gold' in ld_version.stdout.read().decode():
         return False
     ld_version.wait()
 
     return True
 
 if have_ld_plugin_support():
     config.available_features.add('ld_plugin')