code: drawterm

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arm64/tas: use atomic builtin when possible, fixes drawterm on aarch64 android

--- a/posix-arm64/tas.c

+++ b/posix-arm64/tas.c

@@ -1,9 +1,16 @@

 #include "u.h"

 #include "libc.h"

+#ifndef __has_builtin

+#define __has_builtin(x) 0

+#endif

+

 int

 tas(int *x)

 {

+#if __has_builtin(__atomic_test_and_set) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 7)))

+	return __atomic_test_and_set(x, __ATOMIC_ACQ_REL);

+#else

 	int     v,t, i = 1;

 	__asm__ (

@@ -23,4 +30,5 @@

 		print("canlock: corrupted 0x%lux\n", v);

 		return 1;

 	}

+#endif

 }