python2: Improve unicode support

Add --enable-unicode=ucs4 and note that langinfo.h exists. One
result is that sys.stdout.encoding now is UTF-8 instead of None,
which allows e.g. bpython to launch without messing with the
PYTHONIOENCODING environment variable (see #35).

packages/python2/build.sh

@@ -8,7 +8,7 @@ TERMUX_PKG_HOSTBUILD=true
 
 _MAJOR_VERSION=2.7
 TERMUX_PKG_VERSION=${_MAJOR_VERSION}.10
-TERMUX_PKG_BUILD_REVISION=4
+TERMUX_PKG_BUILD_REVISION=5
 TERMUX_PKG_SRCURL=http://www.python.org/ftp/python/${TERMUX_PKG_VERSION}/Python-${TERMUX_PKG_VERSION}.tar.xz
 
 # The flag --with(out)-pymalloc (disable/enable specialized mallocs) is enabled by default and causes m suffix versions of python.
@@ -21,9 +21,8 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_func_ftime=no"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_func_faccessat=no"
 # The gethostbyname_r function does not exist on device libc:
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_func_gethostbyname_r=no"
-# Android does not have langinfo.h:
-TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_header_langinfo_h=no"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" --build=$TERMUX_HOST_TUPLE --disable-ipv6 --with-system-ffi --without-ensurepip"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" --enable-unicode=ucs4"
 
 # Let 2to3 be in the python3 package:
 TERMUX_PKG_RM_AFTER_INSTALL="bin/2to3"