disable dynamic linking/loading code in static libc builds, for now

it does not work, but some configure scripts will falsely detect
support then generate programs that crash when they call dlopen.

src/ldso/dynlink.c

+#ifdef __PIC__
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -681,3 +682,4 @@ int dlclose(void *p)
 {
 	return 0;
 }
+#endif