BuildSystem: using sysroot doesn't need root privileges anymore!

Sysroot is now created with fakeroot. This allows root access to be
only needed for disk image creation, since it uses loopback devices.

libc/CMakeLists.txt

@@ -26,9 +26,8 @@ set(LIBC_SOURCES
 )
 
 add_custom_target(libc-headers
-	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
 	DEPENDS sysroot
-	USES_TERMINAL
 )
 
 add_custom_target(crtx
@@ -38,11 +37,10 @@ add_custom_target(crtx
 )
 
 add_custom_target(crtx-install
-	COMMAND sudo cp crt0.o ${BANAN_LIB}/
-	COMMAND sudo cp crti.o ${BANAN_LIB}/
-	COMMAND sudo cp crtn.o ${BANAN_LIB}/
+	COMMAND ${CMAKE_COMMAND} -E copy crt0.o ${BANAN_LIB}/
+	COMMAND ${CMAKE_COMMAND} -E copy crti.o ${BANAN_LIB}/
+	COMMAND ${CMAKE_COMMAND} -E copy crtn.o ${BANAN_LIB}/
 	DEPENDS crtx
-	USES_TERMINAL
 )
 
 add_library(libc ${LIBC_SOURCES})
@@ -51,10 +49,9 @@ add_dependencies(libc headers crtx-install)
 target_compile_options(libc PRIVATE -g -Wstack-usage=512)
 
 add_custom_target(libc-install
-	COMMAND sudo cp ${CMAKE_CURRENT_BINARY_DIR}/libc.a ${BANAN_LIB}/
+	COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_BINARY_DIR}/libc.a ${BANAN_LIB}/
 	DEPENDS libc
 	BYPRODUCTS ${BANAN_LIB}/libc.a
-	USES_TERMINAL
 )
 
 set(CMAKE_STATIC_LIBRARY_PREFIX "")