packaging: make sure rpcgen runs first in spec

Previously, the build might fail because some cross-directory header
dependencies are not configured correctly. We work around this by
making the ndmp headers first which will run rpcgen before building
anything else.

platforms/packaging/bareos.spec

@@ -809,6 +809,8 @@ export MTX=/usr/sbin/mtx
   --enable-includes
 
 
+# dependency ordering isn't correct, so we run rpcgen first.
+%__make -C src/ndmp ndmp0.h ndmp2.h ndmp3.h ndmp4.h ndmp9.h
 
 #Add flags
 %__make CFLAGS="$RPM_OPT_FLAGS" CXXFLAGS="$RPM_OPT_FLAGS" %{?_smp_mflags};