[libpng16] Made pngvalid so that it will build outside the libpng source tree.

ANNOUNCE

@@ -527,6 +527,7 @@ Version 1.6.0beta30 [October 24, 2012]
 
 Version 1.6.0beta31 [October 26, 2012]
   Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
+  Made pngvalid so that it will build outside the libpng source tree.
 
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CHANGES

@@ -4279,6 +4279,7 @@ Version 1.6.0beta30 [October 24, 2012]
 
 Version 1.6.0beta31 [October 26, 2012]
   Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
+  Made pngvalid so that it will build outside the libpng source tree.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

contrib/libtests/pngvalid.c

@@ -107,7 +107,11 @@ typedef png_byte *png_const_bytep;
 #endif
 
 /***************************** EXCEPTION HANDLING *****************************/
-#include "../visupng/cexcept.h"
+#ifdef PNG_FREESTANDING_TESTS
+#  include <cexcept.h>
+#else
+#  include "../visupng/cexcept.h"
+#endif
 
 #ifdef __cplusplus
 #  define this not_the_cpp_this