[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$B%F%9%H$G4D6-JQ?t$r8+$k$h$&$K$9$Y$-$G$7$g$&$+!)e(B

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

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