separate libaec and szlib compatibility

src/Makefile.am

-lib_LTLIBRARIES = libaec-0.0.la
-libaec_0_0_la_SOURCES = encode.c encode_accessors.c decode.c encode.h encode_accessors.h sz_compat.c
+lib_LTLIBRARIES = libsz-0.0.la libaec-0.0.la
+libaec_0_0_la_SOURCES = encode.c encode_accessors.c decode.c encode.h encode_accessors.h
+libsz_0_0_la_SOURCES = sz_compat.c
 libaec_0_0_la_LDFLAGS = -version-info 0:0
-include_HEADERS = libaec.h
+libsz_0_0_la_LDFLAGS = -version-info 0:0
+include_HEADERS = libaec.h szlib.h
 
 bin_PROGRAMS = aec test_szcomp
 
-aec_LDADD = $(lib_LTLIBRARIES)
+aec_LDADD = libaec-0.0.la
 test_szcomp_LDADD = $(lib_LTLIBRARIES)
 
 aec_SOURCES = aec.c

src/encode_accessors.c

+#include <config.h>
 #include <inttypes.h>
 #include <string.h>
 #include "libaec.h"