...to improve diagnosing misuses of boolean expressions in client code (cf.
compilerplugins/clang/implicitboolconversion.cxx). This change should be
transparent to client code.
Change-Id: Ibed63566266328f84432ad2019e58265d9d30fc3
...since gb_LinkTarget_NOEXCEPTIONFLAGS became unused with
e81b1f23c4 "remove
gb_LinkTarget_add_noexception_object."
Change-Id: I4a7275b5b26a9d4b6ded66efb52e6866e6e09cc3