Make filter_rpath function robust against the case where none of CMAKE_C_IMPLICIT_LINK_DIRECTORIES, CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES, or CMAKE_FORTRAN_IMPLICIT_LINK_DIRECTORIES are defined.  This should never happen according to the CMake documentation, but Phil apparently found a case where it did happen for the "Visual Studio 11" generator (for VS2012).  My conclusion is that generator is severely broken, but nevertheless making this function robust for the case when none of these variables are defined cannot be a bad thing to do.
Make filter_rpath function robust against the case where none of
CMAKE_C_IMPLICIT_LINK_DIRECTORIES,
CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES, or
CMAKE_FORTRAN_IMPLICIT_LINK_DIRECTORIES are defined.  This should
never happen according to the CMake documentation, but Phil apparently
found a case where it did happen for the "Visual Studio 11" generator
(for VS2012).  My conclusion is that generator is severely broken, but
nevertheless making this function robust for the case when none of
these variables are defined cannot be a bad thing to do.


svn path=/trunk/; revision=12864

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot