More optimisation and cleanup for the PNG lib handling in configure.in. Also reordered the variables the same way in the main if test code so that differences now are obvious between the two modes

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6515 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

test/Makefile

@@ -94,8 +94,8 @@ CPPFILES =\
 	tile.cxx \
 	tiled_image.cxx \
 	valuators.cxx \
-	utf8.cxx
-
+	utf8.cxx \
+	utf8c.cxx 
 ALL =	\
 	unittests$(EXEEXT) \
 	adjuster$(EXEEXT) \
@@ -156,7 +156,8 @@ ALL =	\
 	tiled_image$(EXEEXT) \
 	valuators$(EXEEXT) \
 	cairotest$(EXEEXT) \
-	utf8$(EXEEXT) 
+	utf8$(EXEEXT) \
+	utf8c$(EXEEXT) 
 
 
 GLALL = \