Fix issue #5273 for get script on armv7l

This fixes issue #5273 in the get script by making the armv7l
architecture point at the correctly named "arm" binary on the
release page.

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

scripts/get

@@ -29,7 +29,7 @@ initArch() {
   case $ARCH in
     armv5*) ARCH="armv5";;
     armv6*) ARCH="armv6";;
-    armv7*) ARCH="armv7";;
+    armv7*) ARCH="arm";;
     aarch64) ARCH="arm64";;
     x86) ARCH="386";;
     x86_64) ARCH="amd64";;