Fix copyright notices in all files. (#506)

Uses the base git log year for the copyright year.

Author: jonsimantov

build_scripts/android/build.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+# Copyright 2020 Google LLC
+
 buildpath=$1
 sourcepath=$2
 stl=$3

build_scripts/android/install_prereqs.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+# Copyright 2020 Google LLC
+
 if [[ $(uname) == "Darwin" ]]; then
     platform=darwin
     if [[ ! -z "${GHA_INSTALL_CCACHE}" ]]; then

build_scripts/android/package.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+# Copyright 2020 Google LLC
+
 readonly -a allowed_stl_variants=("c++" "gnustl")
 builtpath=$1
 packagepath=$2

build_scripts/desktop/finish_darwin.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+# Copyright 2020 Google LLC
 #
 # Script to finish packaging individual iOS/Mac libraries into
 # universal libraries, and then into frameworks.

build_scripts/desktop/get_variant.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+# Copyright 2020 Google LLC
 set -e
 
 # Given a filename on the command-line, figure out what variant it should be packaged into.

build_scripts/desktop/package.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+# Copyright 2020 Google LLC
 #
 # Script to package desktop SDK
 set -e

build_scripts/ios/build.sh

@@ -1,4 +1,6 @@
 #!/bin/bash -e
+
+# Copyright 2020 Google LLC
 #
 # Script to build iOS XCFrameworks
 # If built for all architectures (arm64 armv7 x86_64 i386),

build_scripts/ios/install_prereqs.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+# Copyright 2020 Google LLC
+
 if [[ $(uname) != "Darwin" ]]; then
     echo "Unsupported platform, iOS can only be build on a MacOS machine."
     exit 1

build_scripts/ios/package.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+# Copyright 2020 Google LLC
+
 builtpath=$1
 packagepath=$2
 

build_scripts/other/package.sh

@@ -1,5 +1,7 @@
 #!/bin/bash -e
 
+# Copyright 2020 Google LLC
+
 sdkpath=$1
 packagepath=$2