[libpng16] Update copyright information in cmake scripts.

scripts/genchk.cmake.in

@@ -1,5 +1,13 @@
+# genchk.cmake.in
 # Generate .chk from .out with awk (generic), based upon the automake logic.
 
+# Copyright (C) 2016 Glenn Randers-Pehrson
+# Written by Roger Leigh, 2016
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Variables substituted from CMakeLists.txt
 set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
 

scripts/genout.cmake.in

@@ -1,5 +1,13 @@
+# genout.cmake.in
 # Generate .out from .c with awk (generic), based upon the automake logic.
 
+# Copyright (C) 2016 Glenn Randers-Pehrson
+# Written by Roger Leigh, 2016
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Variables substituted from CMakeLists.txt
 set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
 set(BINDIR "@CMAKE_CURRENT_BINARY_DIR@")

scripts/gensrc.cmake.in

@@ -1,5 +1,13 @@
+# gensrc.cmake.in
 # Generate source files with awk, based upon the automake logic.
 
+# Copyright (C) 2016 Glenn Randers-Pehrson
+# Written by Roger Leigh, 2016
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Variables substituted from CMakeLists.txt
 set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
 set(BINDIR "@CMAKE_CURRENT_BINARY_DIR@")

scripts/test.cmake.in

@@ -1,3 +1,12 @@
+# test.cmake.in
+
+# Copyright (C) 2016 Glenn Randers-Pehrson
+# Written by Roger Leigh, 2016
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 set(TEST_OPTIONS "@TEST_OPTIONS@")
 set(TEST_FILES "@TEST_FILES@")