package/ncurses: fix build on noMMU uclinux targets

The ncurses buildsystem does not recognise 'uclinux' as being a 'linux',
so it falls back to generic checks, especially when trying to decide
what macros to define. So it misses defining absolutely required macros
when doing widechar, which break the bui,d.

But 'uclinux' is just a 'linux' like any other in this respect.

We fix both aclocal.m4 and the generated ./configure script because
ncurses does not autoreconf correctly (see comment in 0001-*.patch).

Fixes:
    http://autobuild.buildroot.org/results/d5c/d5c787d34acbfc0c0c7bd8cc0e15b5bc2460d88a/
    http://autobuild.buildroot.org/results/fc4/fc4b41fb955c390913a879e0202760347ce29987/
    [...too many to list...]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ncurses/0003-recognise-uclinux.patch

@@ -0,0 +1,30 @@
+aclocal: fix detection for uclinux hosts
+
+uclinux is just a linux like the others...
+
+Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
+
+diff -durN ncurses-5.9.orig/aclocal.m4 ncurses-5.9/aclocal.m4
+--- ncurses-5.9.orig/aclocal.m4	2011-04-01 01:35:38.000000000 +0200
++++ ncurses-5.9/aclocal.m4	2016-08-21 15:24:47.003620029 +0200
+@@ -6531,7 +6531,7 @@
+ irix[[56]].*) #(vi
+ 	cf_xopen_source="-D_SGI_SOURCE"
+ 	;;
+-linux*|gnu*|mint*|k*bsd*-gnu) #(vi
++linux*|uclinux*|gnu*|mint*|k*bsd*-gnu) #(vi
+ 	CF_GNU_SOURCE
+ 	;;
+ mirbsd*) #(vi
+diff -durN ncurses-5.9.orig/configure ncurses-5.9/configure
+--- ncurses-5.9.orig/configure	2016-08-21 15:21:50.789285661 +0200
++++ ncurses-5.9/configure	2016-08-21 15:24:35.187463625 +0200
+@@ -6984,7 +6984,7 @@
+ irix[56].*) #(vi
+ 	cf_xopen_source="-D_SGI_SOURCE"
+ 	;;
+-linux*|gnu*|mint*|k*bsd*-gnu) #(vi
++linux*|uclinux*|gnu*|mint*|k*bsd*-gnu) #(vi
+ 
+ echo "$as_me:6996: checking if we must define _GNU_SOURCE" >&5
+ echo $ECHO_N "checking if we must define _GNU_SOURCE... $ECHO_C" >&6