[Bug preprocessor/107691] [10/11/12/13 Regression] libcpp configure fails on empty expansion

[rep.dot.nop at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107691

--- Comment #4 from rep.dot.nop at gmail dot com <rep.dot.nop at gmail dot com> 
---
The problem was encountered with configure --enable-valgrind-annotations with
valgrind not installed.