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[libc] Move stdarg.h to the common directory

At this point stdarg.h hasn't specific bits, so
it can be ported directly.

--- a/libc/include/amd64-sysv/stdarg.h

+++ /dev/null

@@ -1,18 +1,0 @@

-/* See LICENSE file for copyright and license details. */

-#ifndef _STDARG_H_

-#define _STDARG_H_

-

-typedef struct {

-    unsigned gp_offset;

-    unsigned fp_offset;

-    void *overflow_arg_area;

-    void *reg_save_area;

-} __va_elem;

-

-typedef __va_elem va_list[1];

-

-#define va_start(ap, last) __builtin_va_start((ap), (last))

-#define va_end(ap) __builtin__va_end(ap)

-#define va_copy(to, from) __builtin_va_copy((to), (from))

-

-#endif

--- a/libc/include/qbe/stdarg.h

+++ /dev/null

@@ -1,10 +1,0 @@

-#ifndef _STDARG_H

-#define _STDARG_H

-

-#define va_list __builtin_va_list

-#define va_start(ap, last) __builtin_va_start((ap), (last))

-#define va_end(ap) __builtin_va_end((ap))

-#define va_copy(to, from) __builtin_va_copy((to), (from))

-#define va_arg(to, type) __builtin_va_arg((to), (type))

-

-#endif

--- /dev/null

+++ b/libc/include/stdarg.h

@@ -1,0 +1,11 @@

+/* See LICENSE file for copyright and license details. */

+#ifndef _STDARG_H

+#define _STDARG_H

+

+#define va_list __builtin_va_list

+#define va_start(ap, last) __builtin_va_start((ap), (last))

+#define va_end(ap) __builtin_va_end((ap))

+#define va_copy(to, from) __builtin_va_copy((to), (from))

+#define va_arg(to, type) __builtin_va_arg((to), (type))

+

+#endif