refactor(userspace): build using cmake

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Userspace/libc/libs/libstdc++/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.10)
+project(FennixStandardC++Library)
+
+set(SOURCES libstdc++.cpp)
+
+add_library(stdc++ STATIC ${SOURCES})
+add_library(stdc++_shared SHARED ${SOURCES})
+
+target_link_options(stdc++_shared PRIVATE -nostdlib)
+set_target_properties(stdc++_shared PROPERTIES OUTPUT_NAME "stdc++")
+
+install(TARGETS stdc++ stdc++_shared
+  ARCHIVE DESTINATION lib
+  LIBRARY DESTINATION lib
+  PUBLIC_HEADER DESTINATION include)

Userspace/libc/libs/libstdc++/libstdc++.cpp

@@ -0,0 +1,18 @@
+/*
+	This file is part of Fennix Userspace.
+
+	Fennix Userspace is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Userspace is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Userspace. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/* dummy file */