feat(userspace/libs): add libexpat, libffi and libxml2

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

Userspace/libs/ffi/Makefile

@@ -0,0 +1,27 @@
+build:
+	mkdir -p $(WORKSPACE_DIR)/cache/ffi
+	if [ ! -f "$(WORKSPACE_DIR)/cache/ffi/.configured" ]; then \
+		cd $(WORKSPACE_DIR)/cache/ffi && \
+		$(CURDIR)/libffi-src/configure \
+			--host=x86_64-none-elf \
+			--prefix=/usr \
+			--libdir=/usr/lib \
+			--enable-static \
+			--disable-shared \
+			--disable-docs \
+			--disable-multi-os-directory \
+			CC="$(CC)" \
+			CXX="$(CXX)" \
+			AR="$(AR)" \
+			CFLAGS="-nostdinc -I$(WORKSPACE_DIR)/out/include" \
+			CXXFLAGS="-nostdinc++ -I$(WORKSPACE_DIR)/out/include" \
+			LDFLAGS="-nostdlib -L$(WORKSPACE_DIR)/out/lib -lc" && \
+		touch .configured; \
+	fi
+	$(MAKE) -C $(WORKSPACE_DIR)/cache/ffi -j$(shell nproc)
+	$(MAKE) -C $(WORKSPACE_DIR)/cache/ffi install DESTDIR=$(WORKSPACE_DIR)/out
+	cd $(WORKSPACE_DIR)/cache/ffi && \
+	./libtool --finish $(WORKSPACE_DIR)/out/usr/lib
+
+clean:
+	$(info Nothing to clean)