Xcode: MobileVLCKit: Build with dSYM file only on release

(cherry picked from commit 1c012f6a)
Signed-off-by: Soomin Lee <bubu@mikan.io>

MobileVLCKit.xcodeproj/project.pbxproj

@@ -1153,6 +1153,7 @@
 				);
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_OBJC_ARC = YES;
+				DEBUG_INFORMATION_FORMAT = dwarf;
 				DSTROOT = /tmp/MobileVLCKit.dst;
 				ENABLE_NS_ASSERTIONS = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu11;