cosmetic change for status report of ./configure

CHANGES

@@ -5,6 +5,9 @@ What's New for OpenJPEG
 ! : changed
 + : added
 
+March 5, 2011
+! [antonin] cosmetic change for status report of ./configure
+
 March 4, 2011
 * [antonin] now assume MinGW does not have dirent.h (actually have it but without opendir function). Fixed also a WIN32 check in jp3d/libjp3dvm/openjpeg3d.h.
 ! [antonin] updated autotools files to improve build and install procedures (credit to Vincent Torri).

configure.ac

@@ -179,6 +179,8 @@ AC_PROG_LN_S
 
 # libpng
 
+have_libpng="no"
+
 AC_ARG_ENABLE([png],
    [AC_HELP_STRING([--disable-png], [disable PNG support @<:@default=enabled@:>@])],
    [
@@ -255,6 +257,8 @@ AM_CONDITIONAL([with_libpng], [test x${have_libpng} = "xyes"])
 
 #libtiff
 
+have_libtiff="no"
+
 AC_ARG_ENABLE([tiff],
    [AC_HELP_STRING([--disable-tiff], [disable TIFF support @<:@default=enabled@:>@])],
    [