include_next fails on cross-compiling

[John Darrington]

Cross compiling to host=i586-mingw32msvc I encountered 2 problems  related to 
include_next.m4.

Firstly I had to apply the attached patch to avoid configure complaining about 
missing operands.

Secondly, I had to  put gl_INCLUDE_NEXT in configure.ac  which I was rather 
surprised about.
Since  it's a dependency of rather a lot of modules I had expected it to 
already be indirectly
included.

J'

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