image: Remove some #ifdefs from image-fit and image-fit-sig

Drop the #ifdefs which are easy to remove without refactoring.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/image-fit.c b/common/image-fit.c
index 1e4099d..33b4a46 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -2009,9 +2009,6 @@
 	int type_ok, os_ok;
 	ulong load, load_end, data, len;
 	uint8_t os, comp;
-#ifndef USE_HOSTCC
-	uint8_t os_arch;
-#endif
 	const char *prop_name;
 	int ret;
 
@@ -2103,8 +2100,12 @@
 	}
 
 #ifndef USE_HOSTCC
+	{
+	uint8_t os_arch;
+
 	fit_image_get_arch(fit, noffset, &os_arch);
 	images->os.arch = os_arch;
+	}
 #endif
 
 	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_CHECK_ALL);