copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

1 files changed, 0 insertions, 55 deletions

diff --git a/plan9/BUILD.PLAN9.txt b/plan9/BUILD.PLAN9.txt
deleted file mode 100644
index 6df23d31a..000000000
--- a/plan9/BUILD.PLAN9.txt
+++ /dev/null
@@ -1,55 +0,0 @@
-Prerequirement
-==============
-This document describes how to compile, build and install curl and libcurl
-from sources using mk. To build it, you will require to install latest
-9legacy patches into Plan 9. Also Plan 9 still have no configuration option so
-both zlib and libopenssl are required too.
-
-The zlib that is available on Plan 9 can be downloaded from:
-
-  https://github.com/madler/zlib/pull/398
-
-LibreSSL Portable can be downloaded from:
-
-  https://github.com/libressl-portable/portable/pull/510
-
-Instruction
-===========
-First, you should construct namespace as like described below:
-
-% bind -ac ../lib lib
-% bind -ac ../src src
-% bind -ac ../include include
-% bind -ac .. .
-
-Then you will see as shown below (excerpt):
-
-  curl.git/
-   |_plan9
-   | |_BUILD.PLAN9.txt
-   | |_CHANGES
-   | |_CMake
-   | |  :
-   | |_mkfile
-   | |_mkfile.proto
-   | |_include
-   | | |_Makefile.am
-   | | |  :
-   | | |_mkfile
-   | |_lib
-   | | |_CMakeLists.txt
-   | | |  :
-   | | |_mkfile
-   | | |_mkfile.inc
-   | |_src
-   | | |_CMakeLists.txt
-   | | |  :
-   | | |_mkfile
-   | | |_mkfile.inc
-   |_lib
-   |_src
-
-After constructing namespace, you can run mk on plan9 directory.
-
-% mk
-% mk install