e3abec3f07
The assumption that all configure variables had been normalized to
TRUE/<empty> turned out not to hold; convert a bit more in that
direction.
(regression from 4af38b099c)
Change-Id: I2127c515e8a833a07c9b26ed9d693ce5a1853fe4
m4 - Macros to locate and utilise pkg-config. work around m4 bracket stripping in MINGWSTRIP construction