newlib: No use crt0

Since crt0 cannot be separated from newlib,
there is no point in having it separately.

Signed-off-by: Max Logaev <maxlogaev@proton.me>

libraries/newlib/newlib/configure.host

@@ -431,7 +431,7 @@ fi
 case "${host}" in
   i[3-7]86-*-kolibrios*)
 	sys_dir=kolibrios
-	have_crt0="yes"
+	have_crt0="no"
 	;;
   *-*-cygwin*)
 	posix_dir=posix

libraries/newlib/newlib/libc/include/kolibrios/app.h

@@ -37,7 +37,7 @@ struct menuet02_header
 /**
  * Symbol exported by the linker script for quick access
  */
-__attribute__ ((noreturn)) void ___kosapp_entry (void);
+__attribute__ ((noreturn)) void __kosapp_entry (void);
 extern char __kosapp_image_end[];
 extern char __kosapp_memsize[];
 extern char __kosapp_stack_low[];

libraries/newlib/newlib/libc/sys/kolibrios/libc_init.c

@@ -3,10 +3,25 @@
  * Copyright (C) 2026 KolibriOS team
  */
 
-extern int __init_reent (void);
+#include <kolibrios/app.h>
+#include <stdlib.h>
+
+extern void __init_reent (void);
+extern int main (int argc, char *argv[], char *envp[]);
 
 void
-__libc_init (void)
+__kosapp_entry (void)
 {
+  int rc = 0;
+
+  int argc = 0;
+  char **argv = NULL;
+  char **envp = NULL;
+
   __init_reent ();
+
+  rc = main (argc, argv, envp);
+
+  exit (rc);
+  __builtin_unreachable ();
 }

toolchain/kos-app.lds

@@ -1,7 +1,5 @@
 ENTRY(___kosapp_entry)
 
-STARTUP(crt0.o)
-
 SECTIONS
 {
     .text 0x0: