Remove now unnecessary realpath calls

Library/Homebrew/cmd/info.rb

@@ -58,18 +58,14 @@ module Homebrew extend self
   end
 
   def github_info f
-    path = f.path.realpath
-
-    if path.to_s =~ HOMEBREW_TAP_PATH_REGEX
+    if f.path.to_s =~ HOMEBREW_TAP_PATH_REGEX
       user = $1
       repo = "homebrew-#$2"
       path = $3
     else
-      path.parent.cd do
-        user = github_fork
-      end
+      user = f.path.parent.cd { github_fork }
       repo = "homebrew"
-      path = "Library/Formula/#{path.basename}"
+      path = "Library/Formula/#{f.path.basename}"
     end
 
     "https://github.com/#{user}/#{repo}/commits/master/#{path}"

Library/Homebrew/cmd/log.rb

@@ -5,7 +5,7 @@ module Homebrew extend self
       exec "git", "log", *ARGV.options_only
     else
       begin
-        path = ARGV.formulae.first.path.realpath
+        path = ARGV.formulae.first.path
       rescue FormulaUnavailableError
         # Maybe the formula was deleted
         path = Formula.path(ARGV.named.first)

Library/Homebrew/cmd/versions.rb

@@ -65,7 +65,7 @@ class Formula
   private
     def repository
       @repository ||= begin
-        if path.realpath.to_s =~ HOMEBREW_TAP_DIR_REGEX
+        if path.to_s =~ HOMEBREW_TAP_DIR_REGEX
           HOMEBREW_REPOSITORY/"Library/Taps/#$1-#$2"
         else
           HOMEBREW_REPOSITORY

Library/Homebrew/exceptions.rb

@@ -196,7 +196,7 @@ class BuildError < Homebrew::InstallationError
       unless formula.core_formula?
         ohai "Formula"
         puts "Tap: #{formula.tap}"
-        puts "Path: #{formula.path.realpath}"
+        puts "Path: #{formula.path}"
       end
       ohai "Configuration"
       Homebrew.dump_build_config

Library/Homebrew/formula.rb

@@ -404,11 +404,11 @@ class Formula
   end
 
   def tap?
-    !!path.realpath.to_s.match(HOMEBREW_TAP_DIR_REGEX)
+    HOMEBREW_TAP_DIR_REGEX === path
   end
 
   def tap
-    if path.realpath.to_s =~ HOMEBREW_TAP_DIR_REGEX
+    if path.to_s =~ HOMEBREW_TAP_DIR_REGEX
       "#$1/#$2"
     elsif core_formula?
       "Homebrew/homebrew"
@@ -419,7 +419,7 @@ class Formula
 
   # True if this formula is provided by Homebrew itself
   def core_formula?
-    path.realpath == Formula.path(name)
+    path == Formula.path(name)
   end
 
   def self.path name