Add a libcxx with a new operator

lib/libcxx/CMakeLists.txt

@@ -0,0 +1,15 @@
+add_library(libcxx STATIC
+  src/new.cpp
+  )
+
+target_include_directories(libcxx
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+
+target_link_libraries(libcxx
+  libc
+  zion_lib
+  )
+
+set_target_properties(libcxx PROPERTIES
+  COMPILE_FLAGS "${CMAKE_CXX_FLAGS} -ffreestanding -mgeneral-regs-only")