silently ignore bad #include bug

Given the erroneous sketch

#include <thisLibraryDoesNotExist.h>
void setup() {}
void loop() {}

Arduino 1.5.2 and later fail to report the error
Arduino 1.0.5 and earlier report the error
sketch_feb03a.ino:1:37: warning: thisLibraryDoesNotExist.h: No such file or directory

Peace
--Devon

Arduino 1.0.5 and earlier report the error

Not always, and it's a real pain in the ass when it doesn't. Prior to 1.0, missing include files were ALWAYS reported.