Remove -p calls from shasum. (#24036)

Summary:
Fixes #22873. Given that this code is meant to only work on macOS, we should be fine not using a portable hash. In the packages for which this matters at the bottom of this file, it produces the same hashes so it should be fine.

[General] [Fixed] - Don't use `-p` when invoking shasum.
Pull Request resolved: https://github.com/facebook/react-native/pull/24036

Differential Revision: D14521134

Pulled By: cpojer

fbshipit-source-id: 882e762b7817d9d46bdd405c9e2e9e8b4d7cfaf4

scripts/ios-install-third-party.sh

@@ -32,12 +32,12 @@ function fetch_and_unpack () {
 
     while true; do
         if [ -f "$cachedir/$file" ]; then
-           if shasum -p "$cachedir/$file" |
+           if shasum "$cachedir/$file" |
                awk -v hash="$hash" '{exit $1 != hash}'; then
                break
            else
                echo "Incorrect hash:" 2>&1
-               shasum -p "$cachedir/$file" 2>&1
+               shasum "$cachedir/$file" 2>&1
                echo "Retrying..." 2>&1
            fi
         fi