remove rust/cargo from compilation

it has become clear that incorperating rust in this project was a
mistake, since I don't understand it well enough for it to be useful,
and at this rate it'd be faster to use GLFW in C than in rust.

src/main.c

@@ -1,9 +1,10 @@
 #include "error.h"
 
-extern void test(void);
-
 int main(int argc, char** argv) {
 	(void)argc, (void)argv;
-	test();
-	debug("owo");
+	debug("%s", "owo");
+	info("%s", "owo");
+	warn("%s", "owo");
+	error("%s", "owo");
+	fatal("%s", "owo");
 }