fix ios example to support xcode 7

Change-Id: I059313ba0d9633aa81292cbcee8e676c0d8e130d
diff --git a/vpx_ios/VPXExample/VPXExample.xcodeproj/project.pbxproj b/vpx_ios/VPXExample/VPXExample.xcodeproj/project.pbxproj
index 14bf209..6504bf8 100644
--- a/vpx_ios/VPXExample/VPXExample.xcodeproj/project.pbxproj
+++ b/vpx_ios/VPXExample/VPXExample.xcodeproj/project.pbxproj
@@ -482,6 +482,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
+				ENABLE_BITCODE = YES;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(PROJECT_DIR)/../../../frameworks",
@@ -489,6 +490,7 @@
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "VPXExample-Prefix.pch";
 				INFOPLIST_FILE = "VPXExample-Info.plist";
+				LD_NO_PIE = NO;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				VALID_ARCHS = armv7;
@@ -501,6 +503,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
+				ENABLE_BITCODE = YES;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(PROJECT_DIR)/../../../frameworks",
@@ -508,6 +511,7 @@
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "VPXExample-Prefix.pch";
 				INFOPLIST_FILE = "VPXExample-Info.plist";
+				LD_NO_PIE = NO;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				VALID_ARCHS = armv7;
diff --git a/vpx_ios/VPXExample/ViewController.mm b/vpx_ios/VPXExample/ViewController.mm
index a186651..e4fc7c5 100644
--- a/vpx_ios/VPXExample/ViewController.mm
+++ b/vpx_ios/VPXExample/ViewController.mm
@@ -37,8 +37,8 @@
                       action:@selector(downloadTestFile)
             forControlEvents:UIControlEventTouchUpInside];
   _playButton.enabled = NO;
-  cacheDirectoryPath_ = [NSSearchPathForDirectoriesInDomains(
-      NSCachesDirectory, NSUserDomainMask, YES) lastObject];
+  cacheDirectoryPath_ = [NSURL URLWithString:[NSSearchPathForDirectoriesInDomains(
+      NSCachesDirectory, NSUserDomainMask, YES) lastObject]];
   [self
       appendToOutputTextView:[NSString stringWithFormat:@"libvpx: %s %s",
                                                         VERSION_STRING_NOSP,