Always quote ANDROID_HOME incase of spaces.

nativescript-cli/4116

Author: vB Results, LLC

build.sh

@@ -5,7 +5,7 @@
 ###############################################################################################
 
 echo "Ensure adb is in PATH"
-export PATH=$ANDROID_HOME/platform-tools:$PATH
+export PATH="$ANDROID_HOME/platform-tools:$PATH"
 adb version
 
 echo "Update submodule"
@@ -77,4 +77,4 @@ for emulator in $listOfEmulators; do
 done
 
 echo $cwd
-cd $cwd
+cd $cwd