[devel] Added "--with-zprefix=<string>" to configure.ac

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.0beta57 - December 8, 2010
+Libpng 1.5.0beta57 - December 9, 2010
 
 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.
@@ -226,7 +226,7 @@ version 1.5.0beta24 [May 7, 2010]
     offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
   Added more blank lines for readability.
 
-version 1.5.0beta25 [December 8, 2010]
+version 1.5.0beta25 [December 9, 2010]
   In pngpread.c: png_push_have_row() add check for new_row > height
   Removed the now-redundant check for out-of-bounds new_row from example.c
 
@@ -459,7 +459,7 @@ Version 1.5.0beta56 [December 7, 2010]
   Fixed some incorrect "=" macro names in pnglibconf.dfa
   Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt
 
-Version 1.5.0beta57 [December 8, 2010]
+Version 1.5.0beta57 [December 9, 2010]
   Documented the pngvalid gamma error summary with additional comments and
     print statements.
   Improved missing symbol handling in checksym.awk; symbols missing in both
@@ -470,6 +470,7 @@ Version 1.5.0beta57 [December 8, 2010]
   Enabled the strip16 tests in pngvalid.`
   Don't display test results (except PASS/FAIL) when running "make test".
     Instead put them in pngtest-log.txt
+  Added "--with-zprefix=<string>" to configure.ac
 
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