stop install of things we don't need

Author: notimaginative

lib/CMakeLists.txt

@@ -53,10 +53,10 @@ ADD_SUBDIRECTORY(lz4)
 
 set(HIDAPI_WITH_LIBUSB OFF)
 set(HIDAPI_WITH_HIDRAW ON)
-add_subdirectory(hidapi)
+add_subdirectory(hidapi EXCLUDE_FROM_ALL)
 
 ADD_SUBDIRECTORY(imgui)
 
 if(FSO_BUILD_WITH_OPENXR)
-	add_subdirectory(openxr)
+	add_subdirectory(openxr EXCLUDE_FROM_ALL)
 endif()

lib/antlr4.cmake

@@ -18,7 +18,7 @@ endif()
 set(WITH_DEMO FALSE)
 set(ANTLR4_INSTALL FALSE)
 
-add_subdirectory(antlr4-cpp-runtime)
+add_subdirectory(antlr4-cpp-runtime EXCLUDE_FROM_ALL)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_LIST_DIR}/antlr4-cpp-runtime/cmake" PARENT_SCOPE)
 suppress_warnings(antlr4_static)