making iconv optional on Android

[Hans of Guardian]

It looks like iconv has become required by configure in gnupg.  Can this be optional for Android?  Android is UTF-8 throughout, and iconv is not currently used.

.hc

Begin forwarded message:

> From: jenkins on debeater <root at guardianproject.info>
> Date: March 2, 2014 11:24:50 AM EST
> To: hans at guardianproject.info
> Subject: Build failed in Jenkins: gnupg-for-android-eighthave-git-release-branches #46
> 
> See <http://localhost:18080/job/gnupg-for-android-eighthave-git-release-branches/46/>
> 
> ------------------------------------------
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> configure:
> ***
> *** The system does not provide a working iconv function.  Please
> *** install a suitable library; for example GNU Libiconv which is
> *** available at:
> ***   http://ftp.gnu.org/gnu/libiconv/
> ***
> configure: error: 
> ***
> *** Required libraries not found. Please consult the above messages
> *** and install them before running configure again.
> ***
> make: *** [gnupg/Makefile] Error 1
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