Unify 'which' and which_s' utility methods

'which' only returns a Pathname or nil, and doesn't care about anything
sent to stderr, so just silence it by default and combine the two
methods.

Closes #12115.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/bin/brew b/bin/brew
index eba542724..ac713539c 100755
--- a/bin/brew
+++ b/bin/brew
@@ -72,7 +72,7 @@ begin
 
   # Add example external commands to PATH before checking.
   ENV['PATH'] += ":#{HOMEBREW_REPOSITORY}/Library/Contributions/cmds"
-  if which_s "brew-#{cmd}"
+  if which "brew-#{cmd}"
     %w[CACHE CELLAR LIBRARY_PATH PREFIX REPOSITORY].each do |e|
       ENV["HOMEBREW_#{e}"] = Object.const_get "HOMEBREW_#{e}"
     end