build: compile oslib-obj-y once

There is no difference in oslib-obj-y between user-mode and system
targets.  There used to be when user-mode could optionally be
compiled with PIE.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Makefile.objs

@@ -22,6 +22,8 @@ oslib-obj-y = osdep.o
 oslib-obj-$(CONFIG_WIN32) += oslib-win32.o qemu-thread-win32.o
 oslib-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o
 
+universal-obj-y += $(oslib-obj-y)
+
 #######################################################################
 # coroutines
 coroutine-obj-y = qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o
@@ -62,7 +64,6 @@ common-obj-y = $(block-obj-y) blockdev.o
 common-obj-y += net.o net/
 common-obj-y += qom/
 common-obj-y += readline.o console.o cursor.o
-common-obj-y += $(oslib-obj-y)
 common-obj-$(CONFIG_WIN32) += os-win32.o
 common-obj-$(CONFIG_POSIX) += os-posix.o
 

Makefile.target

@@ -96,7 +96,7 @@ ifdef CONFIG_LINUX_USER
 QEMU_CFLAGS+=-I$(SRC_PATH)/linux-user/$(TARGET_ABI_DIR) -I$(SRC_PATH)/linux-user
 
 obj-y += linux-user/
-obj-y += gdbstub.o thunk.o user-exec.o $(oslib-obj-y)
+obj-y += gdbstub.o thunk.o user-exec.o
 
 endif #CONFIG_LINUX_USER