Upgrading libpng to 1.2.46 to fix a few vulnerabilities.

Bug: 5057432
Bug: 5055636
Change-Id: I9e1b51881386aa9f574a38abc844e036baef9091
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index eb65495..294b0f7 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.44
+PNGMIN = 1.2.46
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names: