[build,android] remove NDK_BUILD

the old build system is no longer in use

scripts/android-build-common.sh

@@ -143,18 +143,6 @@ function common_check_requirements {
 		exit 1
 	fi
 
-	if [ -x $ANDROID_NDK/ndk-build ]; then
-		NDK_BUILD=$ANDROID_NDK/ndk-build
-	else
-		echo "ndk-build not found in NDK directory $ANDROID_NDK"
-		echo "assuming ndk-build is in path..."
-		NDK_BUILD=$(which ndk-build)
-		if [ -z $NDK_BUILD ]; then
-			echo "ndk-build not found in $ANDROID_NDK and not in PATH"
-			exit 1
-		fi
-	fi
-
 	if [ -z $CMAKE_PROGRAM ]; then
 		CMAKE_PROGRAM=$(find $ANDROID_SDK/cmake -name cmake $FIND_ARGS)
 		if [ -z $CMAKE_PROGRAM ]; then
@@ -164,7 +152,7 @@ function common_check_requirements {
 		CMAKE_PROGRAM=$(realpath "$ANDROID_SDK/cmake/${CMAKE_PRORGAM}")
 	fi
 
-	for CMD in make git $CMAKE_PROGRAM $NDK_BUILD
+	for CMD in make git $CMAKE_PROGRAM
 	do
 		if ! type $CMD >/dev/null; then
 			echo "Command $CMD not found. Install and add it to the PATH."