nodejs: security bump to version 6.12.2

Fixes CVE-2017-15896 - Node.js was affected by OpenSSL vulnerability
CVE-2017-3737 in regards to the use of SSL_read() due to TLS handshake
failure.  The result was that an active network attacker could send
application data to Node.js using the TLS or HTTP2 modules in a way that
bypassed TLS authentication and encryption.

For more details, see the announcement:
https://nodejs.org/en/blog/vulnerability/december-2017-security-releases/

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nodejs/Config.in

@@ -43,7 +43,7 @@ config BR2_PACKAGE_NODEJS_V8_ARCH_SUPPORTS
 
 config BR2_PACKAGE_NODEJS_VERSION_STRING
 	string
-	default "6.11.5"		if BR2_PACKAGE_NODEJS_V8_ARCH_SUPPORTS
+	default "6.12.2"		if BR2_PACKAGE_NODEJS_V8_ARCH_SUPPORTS
 	default "0.10.48"
 
 config BR2_PACKAGE_NODEJS_NPM

package/nodejs/nodejs.hash

@@ -1,5 +1,5 @@
 # From upstream URL: http://nodejs.org/dist/v0.10.48/SHASUMS256.txt
 sha256  365a93d9acc076a0d93f087d269f376abeebccad599a9dab72f2f6ed96c8ae6e  node-v0.10.48.tar.xz
 
-# From upstream URL: http://nodejs.org/dist/v6.11.5/SHASUMS256.txt
-sha256  1c6de415216799fbaeca82304b3fef87accc7101ebf2ead7d5c545e0779e8aaf  node-v6.11.5.tar.xz
+# From upstream URL: http://nodejs.org/dist/v6.12.2/SHASUMS256.txt
+sha256  33677c1fcf6a2f35d2718834fd0afdb36166b0cc68349820e05d8f9316b1dafc  node-v6.12.2.tar.xz