Update tests

tests/core/crypto/test_core_crypto_modern.odin

@@ -308,7 +308,7 @@ test_x25519 :: proc(t: ^testing.T) {
 test_rand_bytes :: proc(t: ^testing.T) {
 	log(t, "Testing rand_bytes")
 
-	if ODIN_OS != "linux" {
+	if ODIN_OS != .Linux {
 		log(t, "rand_bytes not supported - skipping")
 		return
 	}

tests/core/image/test_core_image.odin

@@ -1785,7 +1785,7 @@ write_image_as_ppm :: proc(filename: string, image: ^image.Image) -> (success: b
 	}
 
 	mode: int = 0
-	when ODIN_OS == "linux" || ODIN_OS == "darwin" {
+	when ODIN_OS == .Linux || ODIN_OS == .Darwin {
 		// NOTE(justasd): 644 (owner read, write; group read; others read)
 		mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
 	}