[Buildroot] package/gauche: fix build error on BR2_STATIC_LIBS

[Hiroshi Kawashima]

Dear Thomas.

I will do, thank you…

> 2015/11/18 21:38、Thomas Petazzoni <thomas.petazzoni at free-electrons.com> のメール：
> 
> Dear Hiroshi Kawashima,
> 
> On Wed, 18 Nov 2015 18:31:59 +0900, Hiroshi Kawashima wrote:
>> Very sorry.
>> I forget to add [PATCH] in subject, I will send again.
>> Sorry bothering you.
> 
> git does it automatically for you when you use "git format-patch".
> 
> Best regards,
> 
> Thomas
> -- 
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
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