lib: add libc and micro libc

lib/ulibc/CMakeLists.txt

@@ -0,0 +1,19 @@
+set(source_dirs string stdio unistd)
+foreach (dir ${source_dirs})
+	file(GLOB dir_sources ${CMAKE_CURRENT_SOURCE_DIR}/${dir}/*.c)
+	file(GLOB dir_headers ${CMAKE_CURRENT_SOURCE_DIR}/${dir}/*.h)
+
+	set(sources ${sources} ${dir_sources})
+	set(headers ${headers} ${dir_headers})
+endforeach (dir)
+
+set(public_include_dirs
+	${CMAKE_CURRENT_SOURCE_DIR}/include)
+
+rosetta_add_library(
+	NAME ulibc STATIC
+	PUBLIC_INCLUDE_DIRS ${public_include_dirs}
+	SOURCES ${sources}
+	HEADERS ${headers})
+
+target_link_libraries(ulibc libmango)