Fix for CXXFLAGS restore

[David Bateman]

Michael Goffioul wrote:
> Please consider the following changeset for inclusion
> into octave archive. It fixes a CXXFLAGS restore error
> when FTGL headers are not present.
>
> http://hg.tw-math.de/octave-graphics-mq/rev/ceab6e87b1bf
>
> Michael.
>
>   
This seems to be the same problem and fix as listed in the message

http://www.nabble.com/bug-in-configure.in-to17772182.html

D.


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