Fix compiling on Xcode 10

Author: clobber

O2EM.xcodeproj/project.pbxproj

@@ -420,7 +420,10 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				EXPORTED_SYMBOLS_FILE = "";
 				FRAMEWORK_SEARCH_PATHS = "";
-				HEADER_SEARCH_PATHS = "\"$(SRCROOT)/src\"";
+				HEADER_SEARCH_PATHS = (
+					"\"$(SRCROOT)/src\"",
+					"\"$(SRCROOT)/allegrowrapper\"",
+				);
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "\"$(USER_LIBRARY_DIR)/Application Support/OpenEmu/Cores\"";
 				OTHER_CFLAGS = "-D__LIBRETRO__";
@@ -440,7 +443,10 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				EXPORTED_SYMBOLS_FILE = "";
 				FRAMEWORK_SEARCH_PATHS = "";
-				HEADER_SEARCH_PATHS = "\"$(SRCROOT)/src\"";
+				HEADER_SEARCH_PATHS = (
+					"\"$(SRCROOT)/src\"",
+					"\"$(SRCROOT)/allegrowrapper\"",
+				);
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "\"$(USER_LIBRARY_DIR)/Application Support/OpenEmu/Cores\"";
 				OTHER_CFLAGS = "-D__LIBRETRO__";