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build: add PNG_LIBS conditionally

For consistency with other optional libraries, add PNG_LIBS only
if libpng is actually used.

--- a/src/Makefile.am

+++ b/src/Makefile.am

@@ -73,9 +73,13 @@

     libsox_la_SOURCES += spectrogram.c

 endif

+libsox_la_LIBADD =

+

 # Libraries required by libsox for file handlers, effects, or utils;

 # regardless if libltdl is used or not.

-libsox_la_LIBADD = @PNG_LIBS@

+if HAVE_PNG

+libsox_la_LIBADD += @PNG_LIBS@

+endif

 if HAVE_MAGIC

 libsox_la_LIBADD += @MAGIC_LIBS@

 endif