fetch_file: Disable curl's continue/resume mode

This is to fix the following error encountered on Arm infrastructure:

Fetch: http://files.oss.arm.com/downloads/tf-a/linaro/19.06/juno-latest-oe-uboot/SOFTWARE/scp_bl2.bin -> scp_bl2.bin
curl: (33) HTTP server doesn't seem to support byte ranges. Cannot resume.

Change-Id: Iaaf2b961f87e36c5f215317e2f714b7e3db8aaf2
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
diff --git a/utils.sh b/utils.sh
index 43de353..4b60e7a 100644
--- a/utils.sh
+++ b/utils.sh
@@ -127,7 +127,7 @@
 		saveas="${saveas-"$(basename "$url")"}"
 		echo "Fetch: $url -> $saveas"
 		# Use curl to support file protocol
-		curl -sLS -C - $sa "$url"
+		curl -sLS $sa "$url"
 	else
 		sa="${saveas-.}"
 		echo "Fetch: $url -> $sa"