[Bug #3430] ENV 'MAKE' is not considered in the gem test

Bug #3430: ENV ‘MAKE’ is not considered in the gem test.
http://redmine.ruby-lang.org/issues/show/3430

e$B5/I<<Te(B: Masaya T.
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Low
Target version: 1.9.2
ruby -v: ruby 1.9.2dev (2010-06-12 revision 28289) [i386-mswin32_90]

nmake install test-all
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test_self_build_has_makefile(TestGemExtConfigureBuilder)
test_class_build(TestGemExtExtConfBuilder)
test_class_build(TestGemExtExtConfBuilder)
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Expected “nmake”, not “"nmake" > .installed.list”.
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e$B%A%1%C%He(B #3430 e$B$,99?7$5$l$^$7$?!#e(B (by Masaya T.)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B

ruby-coree$B8~$1$G%A%1%C%H$r:n$jD>$7$?$N$G!"$3$A$i$OJD$8$^$9!#e(B


http://redmine.ruby-lang.org/issues/show/3430