change build to use .xcodeproj instead of workspace

AltStore.xcworkspace/contents.xcworkspacedata

@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Workspace
-   version = "1.0">
-   <FileRef
-      location = "group:AltStore.xcodeproj">
-   </FileRef>
-   <FileRef
-      location = "group:Dependencies/AltSign">
-   </FileRef>
-   <FileRef
-      location = "group:Dependencies/minimuxer">
-   </FileRef>
-   <FileRef
-      location = "group:Dependencies/Roxas/Roxas.xcodeproj">
-   </FileRef>
-</Workspace>

AltStore.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>IDEWorkspaceSharedSettings_AutocreateContextsIfNeeded</key>
-	<false/>
-</dict>
-</plist>

Makefile

@@ -169,7 +169,7 @@ MARKETING_VERSION ?=
 BUNDLE_ID_SUFFIX ?= 
 # Common build settings for xcodebuild
 COMMON_BUILD_SETTINGS = \
-	-workspace AltStore.xcworkspace \
+	-project AltStore.xcodeproj \
 	-scheme SideStore \
 	-sdk iphoneos \
 	-configuration $(BUILD_CONFIG) \
@@ -247,7 +247,7 @@ sim-boot-check:
 
 clean-build:
 	@echo "Cleaning build artifacts..."
-	@xcodebuild clean -workspace AltStore.xcworkspace -scheme SideStore
+	@xcodebuild clean -project AltStore.xcodeproj -scheme SideStore
 
 fakesign-apps:
 	rm -rf SideStore.xcarchive/Products/Applications/SideStore.app/Frameworks/AltStoreCore.framework/Frameworks/