[cmake] Don't store build directory include paths in dictionaries

[jmcarcell]

This Pull request:

Changes or fixes:

Dictionaries of ROOT libraries store the build directory include path (${CMAKE_BINARY_DIR}/include) in their includePaths[], which is added to the interpreter when the library is loaded. In an installed ROOT this path does not exist anymore, but it still shows up in gSystem->GetIncludePath(), for example (for any ROOT built in the LCG stacks):

-I"/build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-14a58f74/src/ROOT-14a58f74-build/include"

The include directory is already added by TCling at startup with TROOT::GetIncludeDir(), so storing it in the dictionaries is not needed, also when running from the build directory. The whole build directory used to be excluded before e1751b1, which narrowed the exclusion to ginclude, externals and builtins. The non-module branch of ROOT_GENERATE_DICTIONARY still excludes all of ${CMAKE_BINARY_DIR}. The paths are still passed to rootcling for parsing, only the stored list changes.

Checklist:

• tested changes locally
• updated the docs (if necessary)

[github-actions]

Test Results

    24 files      24 suites   3d 23h 28m 57s ⏱️
 3 888 tests  3 883 ✅ 0 💤 5 ❌
83 225 runs  83 219 ✅ 0 💤 6 ❌

For more details on these failures, see this check.

Results for commit 98b2ddd.

♻️ This comment has been updated with latest results.

[dpiparo]

Thanks! To be checked by ROOT if this is also related #14296

[jmcarcell]

This is only a single path, there are more and this is one way how they can be removed: #14296

[jmcarcell]

The path in the description is now gone in dev3 builds