The configure error "Not configured with libgsf or libole2 but that's
needed for MSI support" is caused by using the wrong configure option
of MSI that was introduced in last commit.
Changing to MSI_CONFIGURE_ENABLE=libgsf to MSI_CONFIGURE_WITH=libgsf
should have solved the problem, but unfortunately there is a logic
flaw in the configure script. If --without-libgsf is passed to it,
it mistakenly tries to find it anyway with pkgconfig and then fails.
The way to fix this properly is to patch the configure script, but I am
going to cheat by making libgsf an unconditional requirement as it was
before adamw fixed the options reversal.
