allow ZipUtilities.framework to be used in extensions (#57)

Author: twitterkb

ZipUtilities.xcodeproj/project.pbxproj

@@ -2419,6 +2419,7 @@
 		4623A8421B9A828A00A56535 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DEVELOPMENT_TEAM = BFWTTPG966;
@@ -2445,6 +2446,7 @@
 		4623A8431B9A828A00A56535 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DEVELOPMENT_TEAM = BFWTTPG966;