Add linux dependency on syscall unit for libc on i386 and x86_64

rtl/inc/Makefile.rtl

@@ -899,6 +899,10 @@ UnixApi.CP$(PPUEXT) : $(NSINC)/UnixApi.CP.pp $(UNIXCP_DEPS)
 #
 ifeq ($(filter -dFPC_USE_LIBC,$(FPCOPT)),)
   LINUX_DEPS_OS+=$(SYSCALLUNIT)$(PPUEXT)
+else
+ifneq ($(filter $(CPU_TARGET),i386 x86_64),)
+  LINUX_DEPS_OS+=$(SYSCALLUNIT)$(PPUEXT)
+endif
 endif
 
 LINUX_DEPS=$(OSDIR)/linux.pp \