Unbreak the build on less common architectures.

Submitted by:	Andreas Tobler <andreast list fgznet ch>

usr.sbin/sysinstall/install.c

@@ -628,8 +628,11 @@ installExpress(dialogMenuItem *self)
 int
 installStandard(dialogMenuItem *self)
 {
-    int i, tries = 0;
+    int i;
+#ifdef WITH_SLICES
+    int tries = 0;
     Device **devs;
+#endif
 
     variable_set2(SYSTEM_STATE, "standard", 0);
     dialog_clear_norefresh();
@@ -874,7 +877,9 @@ installConfigure(void)
 int
 installFixupBase(dialogMenuItem *self)
 {
+#if defined(__i386__) || defined(__amd64__)
     FILE *fp;
+#endif
 #ifdef __ia64__
     const char *efi_mntpt;
 #endif