Warning instead of exception for cmake

platform_tools/android/apps/build.gradle

 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 
 buildscript {
     repositories {
         jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.1.0'
 
@@ skipping 59 matching lines @@
     }
 
     if (!path.contains("depot_tools")) {
         throw GradleScriptException("Depot Tools not found! Please update your path to include" +
                                     " depot_tools or define depot_tools.dir in gradle.properties")
     }
 
     if (requireCMake) {
         String cmakePath = getSDKPath() + "/cmake/bin"
         if (!file(cmakePath).exists()) {
-            throw new GradleScriptException("cmake not found! Please install the android SDK version" +
-                                        " of cmake.", null);
+            logger.warn("cmake not found! Please install the android SDK version of cmake.");
         }
         if (!path.contains(cmakePath)) {
             path = cmakePath + ":" + path
         }
     }
 
     return path
 }
 
 def constructBuildCommand(variant, buildTarget) {
@@ skipping 15 matching lines @@
 
     if (deviceType != null) {
         cmdLine += " -d " + deviceType
     }
 
     if (variant.name.endsWith("Release")) {
         cmdLine += " --release"
     }
     return cmdLine
 }