- include libstdc++fs.a and libstdc++exp.a in sysroot packages
- add libsanitizer sysroot packages
- save testsuite .sum files in build logs
- add packages with files from build tree used in testsuite
- escape \r in dg-regexp test names to avoid truncation in build-tree testing
- fix iconv linking for installed testing
- enable compat testing for installed testing
- distinguish canonical and noncanonical target for installed testing
- add plugin headers packages for cross compilers
- install text-art/*.h plugin headers
- support plugin tests for installed testing
Related: RHEL-114521
