Main: libc/include/stdlib.h> Implement stubs for "exit" and "abort"

Makefile.am

@@ -6,6 +6,7 @@ EXTRA_DIST = autogen.sh CONTRIBUTING.md sha256sums.txt
 SUBDIRS = include
 
 if WITH_LIBC
+# FIXME: after "make clean" libc is not rebuiling
 SUBDIRS += libc
 endif
 

libc/src/stdlib.c

@@ -6,6 +6,18 @@
 #include <stdbool.h>
 #include <stdlib.h>
 
+// TODO: stub
+void exit(const int status __attribute__((unused)))
+{
+    for (;;);
+}
+
+// TODO: stub
+void abort()
+{
+    exit(EXIT_FAILURE);
+}
+
 int atoi(const char *str)
 {
     while (isspace(*str)) ++str;