Improve Xcode project

* Fix a number of platform and deployment target mistakes
* Sync Xcode's idea of files that exist with what's on disk
* Make a dummy target with all the files so Xcode can index their code
* Add a macOS CLI tool to test iSH. Marginally useful in and of itself,
but it keeps the build system from having broken things in it

deps/libarchive.xcodeproj/project.pbxproj

@@ -745,7 +745,9 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				ONLY_ACTIVE_ARCH = YES;
+				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx";
 			};
 			name = Debug;
 		};
@@ -778,6 +780,8 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos macosx";
 			};
 			name = Release;
 		};
@@ -813,13 +817,11 @@
 				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)/libarchive";
-				IPHONEOS_DEPLOYMENT_TARGET = 13.5;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = archive;
-				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -855,12 +857,10 @@
 				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)/libarchive";
-				IPHONEOS_DEPLOYMENT_TARGET = 13.5;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = archive;
-				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;

iSH.xcconfig

@@ -3,6 +3,10 @@ ROOT_BUNDLE_IDENTIFIER = app.ish.iSH
 
 // Choose logging channels to enable. Separate by spaces. Try "verbose strace".
 ISH_LOG =
+ISH_LOGGER = $(ISH_LOGGER_$(PLATFORM_NAME))
+ISH_LOGGER_iphoneos = nslog
+ISH_LOGGER_iphonesimulator = nslog
+ISH_LOGGER_macosx = dprintf
 
 ROOTFS_URL = github.com/ish-app/roots/releases/download/g9ce02ec1eddbf4beee99c6aeca3c99bd4f8b5943/appstore.tar.gz