fix omission of dtv setup in static linked programs on TLS variant I archs

apparently this was never noticed before because the linker normally
optimizes dynamic TLS models to non-dynamic ones when static linking,
thus eliminating the calls to __tls_get_addr which crash when the dtv
is missing. however, some libsupc++ code on ARM was calling
__tls_get_addr when static linked and crashing. the reason is unclear
to me, but with this issue fixed it should work now anyway.

src/env/__init_tls.c

@@ -26,9 +26,9 @@ void *__copy_tls(unsigned char *mem)
 	mem += libc.tls_size - sizeof(struct pthread);
 	mem -= (uintptr_t)mem & (align-1);
 	td = (pthread_t)mem;
-	td->dtv = dtv;
 	mem -= size;
 #endif
+	td->dtv = dtv;
 	dtv[1] = mem;
 	memcpy(mem, image, len);
 	return td;