[apr] build failure

[klalumiere]

Host Environment

• OS: Linux
• Compiler: Ubuntu clang version 15.0.7

To Reproduce

Steps to reproduce the behavior:

• Install apr version 1.7.2 in manifest mode via CMake

Failure logs

CMake Error at scripts/cmake/vcpkg_execute_build_process.cmake:134 (message):
    Command failed: /usr/bin/make V=1 -j 13 -f Makefile all
    Working Directory: /home/klalumiere/src/vcpkg/buildtrees/apr-util/x64-linux-dynamic-dbg/
    See logs for more information:
      /home/klalumiere/src/vcpkg/buildtrees/apr-util/build-x64-linux-dynamic-dbg-out.log
      /home/klalumiere/src/vcpkg/buildtrees/apr-util/build-x64-linux-dynamic-dbg-err.log

and then

   mawk: cannot open /home/klalumiere/src/coveo/cpp/mylib/build/vcpkg_installed/x64-linux-dynamic/debug/lib/manual-link:/home/klalumiere/src/coveo/cpp/mylib/build/vcpkg_installed/x64-linux-dynamic/debug/lib/../build-1/make_exports.awk (No such file or directory)
   mawk: cannot open /home/klalumiere/src/coveo/cpp/mylib/build/vcpkg_installed/x64-linux-dynamic/debug/lib/manual-link:/home/klalumiere/src/coveo/cpp/mylib/build/vcpkg_installed/x64-linux-dynamic/debug/lib/../build-1/make_var_export.awk (No such file or directory)
   make[1]: *** [Makefile:104: exports.c] Error 2
   make[1]: *** Waiting for unfinished jobs....
   make[1]: *** [Makefile:107: export_vars.c] Error 2
   make: *** [/home/klalumiere/src/vcpkg/buildtrees/apr-util/x64-linux-dynamic-dbg/build/rules.mk:119: all-recursive] Error 1

Additional context

I introduced this bug in #30217. I (and the CI) tested with ./vcpkg install, but I forgot to test in manifest mode.

More details: In #30217, I introduced a workaround to get us out of a difficult situation where an absolute path is used. This workaround was necessary because the absolute paths break binary caching. I tested the workaround with ./vcpkg install, but not in manifest mode. Turns out, it doesn't work in manifest mode.

I found a solution to this problem. I'll submit a pull request soon.