test_case.rb: $make before $MAKE

* lib/rubygems/test_case.rb (make_command): try unusual $make
  before usual $MAKE.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50117 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/test_case.rb

@@ -1108,7 +1108,7 @@ Also, a list:
   # other platforms, including Cygwin, it will return 'make'.
 
   def self.make_command
-    ENV["MAKE"] || (vc_windows? ? 'nmake' : 'make')
+    ENV["make"] || ENV["MAKE"] || (vc_windows? ? 'nmake' : 'make')
   end
 
   ##
@@ -1117,7 +1117,7 @@ Also, a list:
   # other platforms, including Cygwin, it will return 'make'.
 
   def make_command
-    ENV["MAKE"] || (vc_windows? ? 'nmake' : 'make')
+    ENV["make"] || ENV["MAKE"] || (vc_windows? ? 'nmake' : 'make')
   end
 
   ##