os: move pub fn debugger_present() bool{ to platform-specific files (better ptrace portability handling) (#17373)

vlib/os/debugger_linux.c.v

@@ -0,0 +1,13 @@
+module os
+
+#include <sys/ptrace.h>
+
+fn C.ptrace(u32, u32, voidptr, voidptr) u64
+
+// debugger_present returns a bool indicating if the process is being debugged
+[inline]
+pub fn debugger_present() bool {
+	// check if the parent could trace its process,
+	// if not a debugger must be present
+	return C.ptrace(C.PTRACE_TRACEME, 0, 1, 0) == -1
+}