Update DYLD_FALLBACK_LIBRARY_PATH to the new path (#416)

We found an app launch crash where it complains cannot load image @rpath/libXCTestSwiftSupport.dylib. 
This dylib is in "platform/Developer/usr/lib" which has an updated path over the years of Xcode evolvement.
Updating the `DYLD_FALLBACK_LIBRARY_PATH` to use the new path so the simulator can pick up the dylib.

Co-authored-by: Ravi Kumar Mandala <rmandala@linkedin.com>

Author: chenxiao0228

bp/src/SimulatorHelper.m

@@ -73,7 +73,7 @@ + (NSDictionary *)appLaunchEnvironmentWithBundleID:(NSString *)hostBundleID
     }
     NSMutableDictionary<NSString *, NSString *> *environment = [@{
                                                                   @"DYLD_FALLBACK_FRAMEWORK_PATH" : [NSString stringWithFormat:@"%@/Library/Frameworks:%@/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks", config.xcodePath, config.xcodePath],
-                                                                  @"DYLD_FALLBACK_LIBRARY_PATH" : [NSString stringWithFormat:@"%@/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib", config.xcodePath],
+                                                                  @"DYLD_FALLBACK_LIBRARY_PATH" : [NSString stringWithFormat:@"%@/Platforms/iPhoneSimulator.platform/Developer/usr/lib", config.xcodePath],
                                                                   @"DYLD_INSERT_LIBRARIES" : libXCTestBundleInjectValue,
                                                                   @"DYLD_LIBRARY_PATH" : [NSString stringWithFormat:@"%@/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks", config.xcodePath],
                                                                   @"DYLD_ROOT_PATH" : [NSString stringWithFormat:@"%@/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot", config.xcodePath],
@@ -155,7 +155,7 @@ + (NSString *)testEnvironmentWithConfiguration:(BPConfiguration *)config {
 
 + (NSString *)bundleIdForPath:(NSString *)path {
     NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:[path stringByAppendingPathComponent:@"Info.plist"]];
-    
+
     NSString *platform = [dic objectForKey:@"DTPlatformName"];
     if (platform && ![platform isEqualToString:@"iphonesimulator"]) {
         [BPUtils printInfo:ERROR withString:@"Wrong platform in %@. Expected 'iphonesimulator', found '%@'", path, platform];

bp/tests/SimulatorHelperTests.m

@@ -20,7 +20,7 @@ @implementation SimulatorHelperTests
 
 - (void)setUp {
     [super setUp];
-    
+
     [BPUtils quietMode:[BPUtils isBuildScript]];
 
 }
@@ -40,6 +40,7 @@ - (void)testAppLaunchEnvironment {
     config.outputDirectory = @"/Users/test/output";
     NSDictionary *appLaunchEnvironment = [SimulatorHelper appLaunchEnvironmentWithBundleID:hostBundleId device:nil config:config];
     XCTAssert([appLaunchEnvironment[@"DYLD_FALLBACK_FRAMEWORK_PATH"] containsString:@"Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks"]);
+    XCTAssert([appLaunchEnvironment[@"DYLD_FALLBACK_LIBRARY_PATH"] containsString:@"Platforms/iPhoneSimulator.platform/Developer/usr/lib"]);
     XCTAssert([appLaunchEnvironment[@"DYLD_INSERT_LIBRARIES"] containsString:@"libXCTestBundleInject.dylib"]);
     XCTAssert([appLaunchEnvironment[@"DYLD_LIBRARY_PATH"] containsString:@"/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks"]);
     XCTAssert([appLaunchEnvironment[@"XCTestConfigurationFilePath"] containsString:@"T/BPSampleAppTests-"]);