mkmf: Unquote directory strings

* lib/mkmf.rb (find_executable0): On Windows, it is actually valid
  to surround individual PATH directory entries with double
  quotes. Remove these before joining the path as otherwise the
  literal quotes would become part of the path, resulting in the
  executable not to be found.  [Fix GH-1305]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54255 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 6e23db8575..31bee93c97 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1551,6 +1551,7 @@ SRC
     end
     file = nil
     path.each do |dir|
+      dir.sub!(/\A"(.*)"\z/m, '\1') if $mswin or $mingw
       return file if executable_file.call(file = File.join(dir, bin))
       if exts
         exts.each {|ext| executable_file.call(ext = file + ext) and return ext}