Fix unused variable warnings

Do not define variables that are not used in Minix builds

Change-Id: I11d12e5e1de9fc359b71a7e7534fc8f09fac837d

lib/libc/arch/arm/misc/arm_initfini.c

@@ -58,7 +58,9 @@ void __section(".text.startup")
 _libc_aapcs_init(void)
 {
 	if (!_libc_aapcs_initialized) {
+#if !defined(__minix)
 		size_t len = sizeof(_libc_arm_fpu_present);
+#endif
 		_libc_aapcs_initialized = true;
 #if !defined(__minix)
 		(void)sysctlbyname("machdep.fpu_present",

lib/libc/resolv/res_init.c

@@ -162,7 +162,9 @@ static uint32_t net_mask(struct in_addr);
 #endif
 
 static struct timespec __res_conf_time;
+#if !defined(__minix)
 static const struct timespec ts = { 0, 0 };
+#endif
 
 /*
  * Resolver state default settings.