Kernel/LibC: Add crt* files to LibC and remove crt0 from kernel

There was no reason for libc get crt0 from kernel.

kernel/CMakeLists.txt

@@ -162,17 +162,6 @@ endif()
 
 target_link_options(kernel PUBLIC -ffreestanding -nostdlib)
 
-add_custom_target(crt0
-	COMMAND ${CMAKE_CXX_COMPILER} -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crt0.S -o ${CMAKE_CURRENT_BINARY_DIR}/crt0.o
-	DEPENDS headers
-)
-
-add_custom_command(
-	TARGET crt0
-	POST_BUILD
-	COMMAND sudo cp ${CMAKE_CURRENT_BINARY_DIR}/crt0.o ${BANAN_LIB}/
-)
-
 add_custom_target(kernel-headers
 	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
 	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/lai/include/ ${BANAN_INCLUDE}/
@@ -193,8 +182,8 @@ add_custom_command(
 	TARGET kernel PRE_LINK
 	COMMAND ${CMAKE_CXX_COMPILER} -MD -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crti.S ${COMPILE_OPTIONS}
 	COMMAND ${CMAKE_CXX_COMPILER} -MD -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crtn.S ${COMPILE_OPTIONS}
-	COMMAND cp ${CRTBEGIN} .
-	COMMAND cp ${CRTEND} .
+	COMMAND ${CMAKE_COMMAND} -E copy ${CRTBEGIN} .
+	COMMAND ${CMAKE_COMMAND} -E copy ${CRTEND} .
 )
 
 #add_custom_command(

kernel/arch/x86_64/crt0.S

@@ -1,34 +0,0 @@
-.section .text
-
-.global _start
-_start:
-	# Set up end of the stack frame linked list.
-	movq $0, %rbp
-	pushq %rbp # rip=0
-	pushq %rbp # rbp=0
-	movq %rsp, %rbp
-
-	# We need those in a moment when we call main.
-	pushq %rdx
-	pushq %rsi
-	pushq %rdi
-
-	# Prepare signals, memory allocation, stdio and such.
-	movq %rdx, %rdi
-	call _init_libc
-
-	# Run the global constructors.
-	call _init
-
-	# Restore argc and argv.
-	popq %rdi
-	popq %rsi
-	popq %rdx
-
-	# Run main
-	call main
-
-	# Terminate the process with the exit code.
-	movl %eax, %edi
-	call exit
-.size _start, . - _start