user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/scripts/get-linux-headers.sh

@@ -0,0 +1,18 @@
+#! /bin/sh
+
+set -ex
+
+LINUX_MAJOR=v6.x
+LINUX_VERSION=6.16
+: "${ARCH:=$(uname -m)}"
+
+curl -Lo linux-$LINUX_VERSION.tar.xz https://cdn.kernel.org/pub/linux/kernel/$LINUX_MAJOR/linux-$LINUX_VERSION.tar.xz
+tar -xf linux-$LINUX_VERSION.tar.xz
+rm linux-$LINUX_VERSION.tar.xz
+cd linux-$LINUX_VERSION
+make mrproper
+make ARCH=$ARCH headers_install
+find usr/include -type f ! -name '*.h' -delete
+mv usr/include ../linux-headers
+cd ..
+rm -rf linux-$LINUX_VERSION