meta: replace cmake mono-build system with a custom build co-ordinator

every system component now has its own self-contained build system, and a
seed file describing the component and its build system and dependencies.

a new tool, meadow, collects and uses these seed files to build the
components into a full system. meadow also manages the target system root
and a host prefix where toolchain tools are installed to.

the build system has also been updated to use a new $ARCH-rosetta-gcc
compiler, and the patches files necessary to build it have been
added to toolchain/cross-compiler.

lib/libxpc/CMakeLists.txt

@@ -1,28 +1,28 @@
+cmake_minimum_required(VERSION 3.31)
+project(xpc C ASM)
+
 file(GLOB sources
 	${CMAKE_CURRENT_SOURCE_DIR}/*.c)
 file(GLOB headers
 	${CMAKE_CURRENT_SOURCE_DIR}/*.h
 	${CMAKE_CURRENT_SOURCE_DIR}/include/xpc/*.h)
 
+file(GLOB public_headers
+	${CMAKE_CURRENT_SOURCE_DIR}/include/xpc/*.h)
+
 set(public_include_dirs
 	${CMAKE_CURRENT_SOURCE_DIR}/include)
 
-rosetta_add_library(
-	NAME libxpc SHARED STATIC
-	PUBLIC_INCLUDE_DIRS ${public_include_dirs}
-	SOURCES ${sources}
-	HEADERS ${headers})
+if (XPC_STATIC)
+	add_library(xpc STATIC ${sources} ${headesr})
+	target_link_libraries(xpc magenta libc-core)
+else ()
+	add_library(xpc SHARED ${sources} ${headesr})
+	target_link_libraries(xpc magenta c)
+endif ()
 
-sysroot_add_library(
-	NAME libxpc
-	HEADER_DIR /usr/include
-	LIB_DIR /usr/lib)
-sysroot_add_library(
-	NAME libxpc-static
-	HEADER_DIR /usr/include
-	LIB_DIR /usr/lib)
-
-target_link_libraries(libxpc libmagenta libc)
-target_link_libraries(libxpc-static libmagenta libc-core)
+target_include_directories(xpc PUBLIC ${public_include_dirs})
 
+install(TARGETS xpc)
+install(FILES ${public_headers} DESTINATION include/xpc)
 #set_target_properties(libxpc-static PROPERTIES POSITION_INDEPENDENT_CODE FALSE)