Update node.js to 4.2.1 from 4.1.2

packages/nodejs/build.sh

@@ -1,6 +1,6 @@
 TERMUX_PKG_HOMEPAGE=http://nodejs.org/
 TERMUX_PKG_DESCRIPTION="Platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications"
-TERMUX_PKG_VERSION=4.1.2
+TERMUX_PKG_VERSION=4.2.1
 TERMUX_PKG_SRCURL=https://nodejs.org/dist/latest/node-v${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--dest-os=android --shared-openssl --shared-zlib --shared-libuv"
 TERMUX_PKG_DEPENDS="openssl, libuv"
@@ -8,7 +8,8 @@ TERMUX_PKG_RM_AFTER_INSTALL="lib/node_modules/npm/html lib/node_modules/npm/make
 TERMUX_PKG_BUILD_IN_SRC=yes
 
 termux_step_configure () {
-	#FIXME:
+	#FIXME: node.js build does not handle already installed headers
+	#       https://github.com/nodejs/node/issues/2637
 	rm -Rf $TERMUX_PREFIX/{include/gtest/,/include/ares*}
 
 	if [ $TERMUX_ARCH = "arm" ]; then