Install gcc's target shared library to $sysroot/usr/lib for easier qemu use

Makefile.in

@@ -16,6 +16,12 @@ WITH_ARCH ?= @WITH_ARCH@
 MULTILIB ?=
 SYSROOT := $(INSTALL_DIR)/sysroot
 
+ifeq ($(XLEN),32)
+LIBDIR := lib32
+else
+LIBDIR := lib
+endif
+
 SHELL := /bin/sh
 AWK := @GAWK@
 SED := @GSED@
@@ -222,6 +228,7 @@ stamps/build-gcc-linux-stage2: $(srcdir)/riscv-gcc stamps/build-glibc-linux$(XLE
 		$(WITH_ARCH)
 	$(MAKE) -C $(notdir $@)
 	$(MAKE) -C $(notdir $@) install
+	cp $(INSTALL_DIR)/riscv$(XLEN)-unknown-linux-gnu/$(LIBDIR)/lib*.so* $(SYSROOT)/usr/$(LIBDIR)
 	mkdir -p $(dir $@) && touch $@
 
 stamps/build-binutils-newlib: $(srcdir)/riscv-binutils-gdb