delete: Remove multistrap as it is no longer needed

multistrap was introduced when mmdebstrap could not be used to build the root filesystem. Now that the project has successfully transitioned to using mmdebstrap, multistrap is redundant.

Changes:
- termux#376
- termux@bb97e3c

.github/workflows/build.yml

@@ -50,7 +50,7 @@ jobs:
           # Remove distro plugins to filter and upload built distributions and its plugins later on
           rm -rf ./distro-plugins/*
       - name: Install Needed Dependencies
-        run: sudo apt-get update && sudo apt-get install -yq curl debian-archive-keyring jq mmdebstrap qemu-user-static binfmt-support multistrap
+        run: sudo apt-get update && sudo apt-get install -yq curl debian-archive-keyring jq mmdebstrap qemu-user-static binfmt-support
       - name: Build distribution rootfs
         run: |
           distros_to_be_built=$(cat ./distributions.txt)

bootstrap-rootfs.sh

@@ -10,7 +10,7 @@ if [ "$(uname -o)" = "Android" ]; then
 	exit 1
 fi
 
-for i in curl git jq mmdebstrap sudo tar xz multistrap; do
+for i in curl git jq mmdebstrap sudo tar xz; do
 	if [ -z "$(command -v "$i")" ]; then
 		echo "[!] '$i' is not installed."
 		exit 1