build: fix use of rpc.h on cygwin
build: fix use of rpc.h on cygwin

Caused by commit 012c25e8 splitting out a convenience library.

  CC       libvirtd_conf_la-libvirtd-config.lo
In file included from ../src/rpc/virnetmessage.h:24:0,
                 from ../src/rpc/virnetserverprogram.h:27,
                 from ../src/rpc/virnetserver.h:32,
                 from libvirtd-config.c:31:
../src/rpc/virnetprotocol.h:9:21: fatal error: rpc/rpc.h: No such file
or directory

* daemon/Makefile.am (libvirtd_conf_la_CFLAGS): Add XDR_CFLAGS.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

elmarco/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,jfehlig/libvirt,jardasgit/libvirt,agx/libvirt,datto/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,datto/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,andreabolognani/libvirt,rlaager/libvirt,olafhering/libvirt,libvirt/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,elmarco/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,zippy2/libvirt,agx/libvirt,nertpinx/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,crobinso/libvirt,zippy2/libvirt,nertpinx/libvirt,agx/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,olafhering/libvirt,jardasgit/libvirt,zippy2/libvirt,nertpinx/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,andreabolognani/libvirt,taget/libvirt,datto/libvirt,elmarco/libvirt,libvirt/libvirt,jfehlig/libvirt,andreabolognani/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,shugaoye/libvirt,eskultety/libvirt,shugaoye/libvirt,nertpinx/libvirt,taget/libvirt,cbosdo/libvirt,datto/libvirt,taget/libvirt,eskultety/libvirt,elmarco/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,olafhering/libvirt,rlaager/libvirt,rlaager/libvirt,crobinso/libvirt,datto/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,eskultety/libvirt,agx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jfehlig/libvirt,taget/libvirt,agx/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,crobinso/libvirt,cbosdo/libvirt,rlaager/libvirt,elmarco/libvirt,eskultety/libvirt