Let iconv build on Cygwin without installing Cygwin libiconv package

[jpflori]

Crafting a somehow minimal Cygwin install, I got the libiconv2 package with binaries installed but the libiconv one with dev things is not.

Because of that building our libiconv spkg fails because it uses the system libintl which points to libiconv files provided in the dev libiconv package (and not the libiconv2).

Maybe the easiest solution is to prereq the installation of the dev libiconv package, but we can also go by passing --disable-nls to configure.

Use spkg at
http://boxen.math.washington.edu/home/jpflori/iconv-1.13.1.p4.spkg

(I'll investigate in a follow-up ticket if building our own libiconv is actually needed on Cygwin nowadays.)

CC: @kcrisman

Component: packages: standard

Keywords: cygwin iconv spkg

Author: Jean-Pierre Flori

Reviewer: Jeroen Demeyer

Merged: sage-5.7.beta0

Issue created by migration from https://trac.sagemath.org/ticket/13912

[jpflori]

Description changed:

--- 
+++ 
@@ -4,4 +4,7 @@
 
 Maybe the easiest solution is to prereq the installation of the dev libiconv package, but we can also go by passing --disable-nls to configure.
 
+Use spkg at
+http://boxen.math.washington.edu/home/jpflori/iconv-1.13.1.p4.spkg
+
 (I'll investigate in a follow-up ticket if building our own libiconv is actually needed on Cygwin nowadays.)

[jdemeyer]

Reviewer: Jeroen Demeyer

[jdemeyer]

comment:2

I cannot test on Cygwin, but I assumes this solves your problem. Anyway, the patch itself looks good.

[jdemeyer]

comment:3

Hang on, isn't this a typo:

CYGGWIN