LibImage: Move userspace image parsing to its own library

The image utility now uses this tool instead of parsing images on its
own.

LibImage/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(libimage CXX)
+
+set(LIBIMAGE_SOURCES
+	Image.cpp
+	Netbpm.cpp
+)
+
+add_custom_target(libimage-headers
+	COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	DEPENDS sysroot
+)
+
+add_library(libimage ${LIBIMAGE_SOURCES})
+add_dependencies(libimage headers libc-install)
+target_link_libraries(libimage PUBLIC libc)
+
+add_custom_target(libimage-install
+	COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_BINARY_DIR}/libimage.a ${BANAN_LIB}/
+	DEPENDS libimage
+	BYPRODUCTS ${BANAN_LIB}/libimage.a
+)
+
+set(CMAKE_STATIC_LIBRARY_PREFIX "")