Hack around gdb >= 7.0 trying to globally install syscall/*linux.xml.

contrib/crossrpms/gdb/install.add

@@ -26,5 +26,19 @@
 # host library, installed to a bogus directory
   rm -f ${RPM_BUILD_ROOT}%{_libdir}/lib@tool_target@-sim.a
 
+%if "%{gdb_version}" >= "7.0"
+# Bug in gdb-7.0, bogusly installs linux-only files
+  somethinguseful=0
+  for f in ${RPM_BUILD_ROOT}%{_datadir}/gdb/syscalls/*.xml; do
+    case $f in
+    *linux.xml) rm -f $f;;
+    *.xml) somethinguseful=1;;
+    esac
+  done
+  if test $somethinguseful -eq 0; then
+    rm -rf "${RPM_BUILD_ROOT}%{_datadir}/gdb/syscalls"
+  fi
+%endif
+
   cd ..