toolchain: replace ifc interface compiler with xpcg

xpcg is used to generate xpc interfaces

toolchain/xpcg/CMakeLists.txt

@@ -0,0 +1,7 @@
+file(GLOB sources
+	*.c *.h
+	backend/c-mpc/*.c backend/c-mpc/*.h)
+
+add_executable(xpcg ${sources})
+
+target_link_libraries(xpcg Bluelib::Core Bluelib::Ds Bluelib::Cmd Bluelib::Io)