Ensure assert_fail and abort have noreturn attribute

src/c/stack_chk.c

@@ -3,7 +3,7 @@
 uintptr_t __stack_chk_guard = 0xd048c37519fcadfe;
 
 // manually define detailed abort function
-void __abort(const char *func, const char *file, int line);
+void __abort(const char *func, const char *file, int line) __attribute__((noreturn));
 
 __attribute__((noreturn))
 void __stack_chk_fail(void) {

src/c/stdlib.c

@@ -3,12 +3,3 @@ double strtod(const char *nptr, char **endptr);
 long double strtold(const char *nptr, char **endptr) {
     return (long double)strtod(nptr, endptr);
 }
-
-// manually define detailed abort function
-void __abort(const char *func, const char *file, int line);
-
-// backup definition of abort for programs that link it directly
-void abort(void) {
-    // call detailed abort function
-    __abort(__func__, __FILE__, __LINE__);
-}