[libpng16] Update internal version numbering and SO-numbers
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index ac70940..5e6d251 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -10,7 +10,7 @@
 LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
-SHLIB_MAJOR=	15
+SHLIB_MAJOR=	16
 SHLIB_MINOR=	1.6.0alpha01
 
 LIB=	png