lib: c: combine libc and ulibc

libc is now made up of several independent components, each of which is individually compiled into a static library.
they are then all combined into a single shared library.

lib/libc/core/CMakeLists.txt

@@ -0,0 +1,23 @@
+set(source_dirs stdio string)
+
+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(component_sources ${sources} PARENT_SCOPE)
+set(component_headers ${headers} PARENT_SCOPE)
+
+rosetta_add_library(STATIC
+	NAME libc-core
+	PUBLIC_INCLUDE_DIRS ${public_include_dirs}
+	SOURCES ${sources}
+	HEADERS ${headers})
+
+sysroot_add_library(
+	NAME libc-core
+	HEADER_DIR /usr/include
+	LIB_DIR /usr/lib)