configure script does not check libpng version

[jbrowsetix]

If libpng version is <1.4.0, linking of wig2png fails with the error message "undefined reference to `png_set_longjmp_fn’"

This could be fixed by updating the autoconf script (configure.in) to check the version of libpng, or (alternatively) to test for "png_set_longjmp_fn" in the AC_SEARCH_LIBS macro, rather than the current test for "png_create_write_struct"

original LH ticket

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[rbuels]

Ran the wig2png build unmodified on old Debian Etch with libpng 1.2 and it ran fine. Closing.