Elevate .text.syscall to .privileged

It turns out adding OpenBSD msyscall() origin verification broke the
--ftrace flag. The executable needs to issue raw syscalls while it's
rewriting itself. So they need to be in the same section, and that's
just plain simpler too.

libc/integral/c.inc

@@ -620,7 +620,6 @@ typedef uint64_t uintmax_t;
 #define textexit    _Section(".text.exit") noinstrument
 #define textreal    _Section(".text.real")
 #define textwindows _Section(".text.windows")
-#define textsyscall _Section(".text.syscall") noinline
 #define antiquity   _Section(".text.antiquity")
 #else
 #define testonly