[zig] Fix zig examples for wasm

[maiconpintoabreu]

This is to avoid issues like:

zig build -Dtarget=wasm32-emscripten shaders_julia_set

wasm-ld: error: ./.zig-cache/o/0065c975c3f510f2f1172863c35c7e75/libshaders_julia_set.a(.zig-cache/o/b1603d96a02a9f3e8ae33663be1ac2aa/shaders_julia_set.o): undefined symbol: __ubsan_handle_out_of_bounds
wasm-ld: error: ./.zig-cache/o/0065c975c3f510f2f1172863c35c7e75/libshaders_julia_set.a(.zig-cache/o/b1603d96a02a9f3e8ae33663be1ac2aa/shaders_julia_set.o): undefined symbol: __ubsan_handle_pointer_overflow

[raysan5]

@maiconpintoabreu -fsanitize=address enables Address Sanitizer, that is useful for memory issues debugging increasing runtime overhead. Definitely not what we want for a production build.

Not sure why that error but this is not the solution.

[maiconpintoabreu]

@raysan5 It can be set to "-fsanitize=undefined", if not set to anything it gives the error.