build: buildinfo.txt improvements

- cmake: drop `configure.os`.
  This also includes OS version, but thus far it's not important enough
  to include it.
- autotools: drop redundant, autotools-only `{target|host}.vendor`.
  (it's part of the triplet in `{target|host}`.)
- swap order to `*.cpu` -> `*.os` to match triplet-order.
- cmake: drop redundant `target`.
  It's manually filled and only in a (so far) few CI jobs. Let's revisit
  when this becomes useful.
- move `buildinfo.txt` to build root.
- dist: add `buildinfo.txt` to `DISTCLEANFILES`.
- autotools: detect human readable compiler version.
- autotools: replace `XXYY` `compiler.version` with "X.Y"-style.
  (also to match cmake.)
- autotools: use distinct `compiler_id` for Apple clang: `APPLECLANG`.
  To match cmake and also because the the "X.Y"-style version number
  is the Apple version, while `XXYY` was a value roughly translated to
  mainline llvm/clang version.
- show buildinfo at the end of the configure stage, when run in CI, or
  when `CURL_BUILDINFO` or `CURL_CI` env is set.

Follow-up to 1fdea16846 #14802
Assisted-by: Dan Fandrich
Ref: https://github.com/curl/curl/pull/14802#issuecomment-2334942991
Closes #14822

tests/.gitignore

@@ -4,7 +4,6 @@
 
 *pid
 *.1.dist
-buildinfo.txt
 configurehelp.pm
 curl_client_key
 curl_client_key.pub

tests/CMakeLists.txt

@@ -94,25 +94,6 @@ use vars qw(
 1;
 ")
 
-# Save build info for test runner to pick up and log
-file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/buildinfo.txt" "# This is a generated file.  Do not edit.
-configure.tool: cmake
-configure.command: ${CMAKE_COMMAND}
-configure.version: ${CMAKE_VERSION}
-configure.os: ${CMAKE_SYSTEM}
-configure.args:${_cmake_args}
-configure.generator: ${CMAKE_GENERATOR}
-configure.make: ${CMAKE_MAKE_PROGRAM}
-host.os: ${CMAKE_HOST_SYSTEM_NAME}
-host.cpu: ${CMAKE_HOST_SYSTEM_PROCESSOR}
-target: ${CMAKE_C_COMPILER_TARGET}
-target.os: ${CMAKE_SYSTEM_NAME}
-target.cpu: ${CMAKE_SYSTEM_PROCESSOR}
-target.flags:${_target_flags}
-compiler: ${CMAKE_C_COMPILER_ID}
-compiler.version: ${CMAKE_C_COMPILER_VERSION}
-")
-
 add_runtests(test-quiet     "-a -s")
 add_runtests(test-am        "-a -am")
 add_runtests(test-full      "-a -p -r")

tests/runtests.pl

@@ -2598,11 +2598,11 @@ if(!$listonly) {
 # Output information about the curl build
 #
 if(!$listonly) {
-    if(open(my $fd, "<", "buildinfo.txt")) {
+    if(open(my $fd, "<", "../buildinfo.txt")) {
         while(my $line = <$fd>) {
             chomp $line;
             if($line && $line !~ /^#/) {
-                logmsg("* buildinfo.$line\n");
+                logmsg("* $line\n");
             }
         }
         close($fd);