[rcore_web] Web examples fail to compile (missing recipes)

[ColleagueRiley]

Issue description

The Makefile.Web makefile is failing to compile the web examples using make PLATFORM=PLATFORM_WEB -B

The error is:

core/core_basic_window_web.c:18:10: fatal error: 'raylib.h' file not found
   18 | #include "raylib.h"

This is because there is a missing recipe for this example. I was able to compile the example by adding that recipe, but there were still similar errors occurring due to other missing recipes.

Environment

Arch Linux.