message: Fix logging styleing and return code check.
diff: @@ -103,8 +103,8 @@ interface ClangVersion {
  async function getClangVersion(binPath: string): Promise<ClangVersion|null> {
  log.debug('Testing Clang-ish binary:', binPath);
  const exec = await proc.execute(binPath, ['-v']).result;
  - if (exec.retc != 0) {
  - log.debug('Bad Clang binary ("-v" returns non-zero)', binPath);
  + if (exec.retc !== 0) {
  + log.debug('Bad Clang binary ("-v" returns non-zero):', binPath);
  return null;
  }
  const first_line = exec.stderr.split('\n')[0];
  @@ -158,8 +158,8 @@ export async function kitIfCompiler(bin: string, pr?: ProgressReporter): Promise
  if (pr)
  pr.report({message: `Getting GCC version for ${bin}`});
  const exec = await proc.execute(bin, ['-v']).result;
  - if (exec.retc != 0) {
  - log.debug('Bad GCC binary ("-v" returns non-zero)', bin);
  + if (exec.retc !== 0) {
  + log.debug('Bad GCC binary ("-v" returns non-zero):', bin);
  return null;
  }
  @@ -201,8 +201,8 @@ export async function kitIfCompiler(bin: string, pr?: ProgressReporter): Promise
  // Check for working mingw32-make
  const execMake = await proc.execute(mingwMakePath, ['-v'], null, {environment: {PATH: binParentPath}}).result;
  - if (execMake.retc != 0) {
  - log.debug('Bad mingw32-make binary ("-v" returns non-zero)', bin);
  + if (execMake.retc !== 0) {
  + log.debug('Bad mingw32-make binary ("-v" returns non-zero):', bin);
  } else {
  let make_version_output = execMake.stdout;
  if (make_version_output.length == 0)
  