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/runtime/CMakeLists.txt

@@ -0,0 +1,11 @@
+file(GLOB runtime_sources
+	${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_SYSTEM_PROCESSOR}/*.s)
+set_property(SOURCE ${runtime_sources} PROPERTY LANGUAGE C)
+
+rosetta_add_object_library(
+	NAME libc-runtime STATIC
+	SOURCES ${runtime_sources})
+
+sysroot_add_object_library(
+	NAME libc-runtime
+	LIB_DIR /usr/lib)