Bug#1112297: libhdf4 FTCBFS: szlib encoder test cannot be run

[Helmut Grohne]

Source: libhdf4
Version: 4.3.1-1
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

libhdf4 fails to cross build from source, because it uses AC_RUN_IFELSE 
to check for whether SZ_encoder_enabled() returns true-ish. We cannot 
test this during cross compilation, but it has only ever returned 
trueish for a long time. Therefore I suggest accepting a patch that 
guesses the result as trueish for cross compilation only.

Helmut
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