Set the Debug configuration optimization level to -O0 to make LLDB usable

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

VLC for iOS.xcodeproj/project.pbxproj

@@ -2980,7 +2980,6 @@
 				COPY_PHASE_STRIP = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
-				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
 					"$(inherited)",
@@ -3039,7 +3038,7 @@
 					"\"$(SRCROOT)/ImportedSources/Dropbox\"",
 				);
 				GCC_C_LANGUAGE_STANDARD = c99;
-				GCC_OPTIMIZATION_LEVEL = 2;
+				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "Sources/VLC for iOS-Prefix.pch";
 				HEADER_SEARCH_PATHS = (