[libpng16] Don't install pngcp; it conflicts with pngcp in the pngtools package.

Moved it from bin_PROGRAMS to check_PROGRAMS in Makefile.am so it will be
built but not installed.

ANNOUNCE

-Libpng 1.6.25beta02 - August 12, 2016
+Libpng 1.6.25beta02 - August 14, 2016
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -30,7 +30,8 @@ Version 1.6.25beta01 [August 12, 2016]
   Cleaned up PNG_DEBUG compile of pngtest.c.
   Conditionally compile png_inflate().
 
-Version 1.6.25beta02 [August 12, 2016]
+Version 1.6.25beta02 [August 14, 2016]
+  Don't install pngcp; it conflicts with pngcp in the pngtools package.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CHANGES

@@ -5680,7 +5680,8 @@ Version 1.6.25beta01 [August 12, 2016]
   Cleaned up PNG_DEBUG compile of pngtest.c.
   Conditionally compile png_inflate().
 
-Version 1.6.25beta02 [August 12, 2016]
+Version 1.6.25beta02 [August 14, 2016]
+  Don't install pngcp; it conflicts with pngcp in the pngtools package.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

Makefile.am

@@ -12,13 +12,13 @@ PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
 ACLOCAL_AMFLAGS = -I scripts
 
 # test programs - run on make check, make distcheck
-check_PROGRAMS= pngtest pngunknown pngstest pngvalid pngimage
+check_PROGRAMS= pngtest pngunknown pngstest pngvalid pngimage pngcp
 if HAVE_CLOCK_GETTIME
 check_PROGRAMS += timepng
 endif
 
 # Utilities - installed
-bin_PROGRAMS= pngcp pngfix png-fix-itxt
+bin_PROGRAMS= pngfix png-fix-itxt
 
 # This ensures that pnglibconf.h gets built at the start of 'make all' or
 # 'make check', but it does not add dependencies to the individual programs,