[Backport #2512] CC is ignored in ext

Backport #2512: CC is ignored in ext

e$B5/I<<Te(B: Nobuyoshi N.
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Normal
e$BC4Ev<Te(B: Yuki S., e$B%+%F%4%je(B: build

1.9,1.8e$B$H$b$Ke([email protected]$7$F$"$j$^$9!#e(B

e$B%A%1%C%He(B #2512 e$B$,99?7$5$l$^$7$?!#e(B (by Yuki S.)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

This issue was solved with changeset r27593.
Nobuyoshi, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.