Extract args processing in deps scripts

Extract the code that processes arguments into a function.

This will make it optional, so the script that only downloads the
official ADB binaries will not use arguments.

PR #5515 <https://github.com/Genymobile/scrcpy/pull/5515>

app/deps/adb.sh

@@ -3,6 +3,7 @@ set -ex
 DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
 cd "$DEPS_DIR"
 . common
+process_args "$@"
 
 VERSION=35.0.2
 FILENAME=platform-tools_r$VERSION-win.zip

app/deps/common

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # This file is intended to be sourced by other scripts, not executed
 
+process_args() {
     if [[ $# != 1 ]]
     then
         # <host>: win32 or win64
@@ -20,6 +21,7 @@ else
         echo "Unsupported host: $HOST" >&2
         exit 1
     fi
+}
 
 DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
 cd "$DEPS_DIR"

app/deps/ffmpeg.sh

@@ -3,6 +3,7 @@ set -ex
 DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
 cd "$DEPS_DIR"
 . common
+process_args "$@"
 
 VERSION=7.1
 FILENAME=ffmpeg-$VERSION.tar.xz

app/deps/libusb.sh

@@ -3,6 +3,7 @@ set -ex
 DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
 cd "$DEPS_DIR"
 . common
+process_args "$@"
 
 VERSION=1.0.27
 FILENAME=libusb-$VERSION.tar.gz

app/deps/sdl.sh

@@ -3,6 +3,7 @@ set -ex
 DEPS_DIR=$(dirname ${BASH_SOURCE[0]})
 cd "$DEPS_DIR"
 . common
+process_args "$@"
 
 VERSION=2.30.9
 FILENAME=SDL-$VERSION.tar.gz