rtlib/emscripten: when running under node.js write directly to process.stdout

This fixes an extra newline being appended after every PRINT due to console.log().

This is a quick fix just for write() in fb_rtlib.js. No other rtlib functions, e.g.
COLOR, are implemented.

But there's really no overlap between the existing termlib.js-based fb_rtlib.js
and one that directly accesses a tty through node.js, so we should just have a
separate .js file for that.

Author: rversteegen

lib/fb_rtlib.js

@@ -53,10 +53,13 @@ var __fb_rtlib =
 		{
 			if( this.term === null )
 			{
-				console.log(text);
+				// Under node.js write to stdout. console.log adds an extra newline
+				if( typeof process !== 'undefined' )
+					process.stdout.write(text);
+				else
+					console.log(text);
 				return;
 			}
-			
 			this.term.write('%c(' + this.fg_color + ',' + this.bg_color + ')' + text.replace('%(', '%%('));
 		},