[Lightning] [patch] test for zlib in configure.ac

[Brandon Invergo]

Hi,

In packaging lightning 2.0.0 for GNU SRC, I encountered the following
build error:

make[4]: Leaving directory 
`/home/brandon/Projects/gsrc/trunk/gnu/lightning/work/lightning-2.0.0/lib'
/bin/sh ../libtool  --tag=CC   --mode=link gcc -I../include -D_GNU_SOURCE -g 
-O2  -L/home/brandon/gnu/lib -o incr incr.o ../lib/liblightning.la -lm -ldl -lm 
-lopcodes -lbfd -liberty
libtool: link: gcc -I../include -D_GNU_SOURCE -g -O2 -o .libs/incr incr.o  
-L/home/brandon/gnu/lib ../lib/.libs/liblightning.so -ldl -lm -lopcodes -lbfd 
-liberty -Wl,-rpath -Wl,/home/brandon/gnu/lib
../lib/.libs/liblightning.so: undefined reference to `compress'
../lib/.libs/liblightning.so: undefined reference to `inflate'
../lib/.libs/liblightning.so: undefined reference to `compressBound'
../lib/.libs/liblightning.so: undefined reference to `inflateEnd'
../lib/.libs/liblightning.so: undefined reference to `inflateInit_'
../lib/.libs/liblightning.so: undefined reference to `inflateReset'
collect2: error: ld returned 1 exit status

It was resolved by explicitly checking for zlib in configure.ac, which
properly adds it to LIBS.  I've attached a patch below.

Cheers,
Brandon

lightning-2.0.0-check-zlib.diff
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-- 
Brandon Invergo
http://brandon.invergo.net

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