Update changelog entry
Remove internal details. Add the condition of the bug.
Bugfix
- * Fix a build bug : when parallel out-of-box build with cmake, it raise file
- not found error. That's due to same target is included in different sub-
- makefiles. And cmake will call the targets in different forked `make`
- process. As a result, the dependancy will be broken. This fix remove the
- targets in sub-makefiles and create a global target for it.
+ * Fix a race condition in out-of-source builds with CMake when generated data
+ files are already present. Fixes #5374
