wrong; linking with -pthread will not get recorded and induce other
issues while non-threaded apps won't be able to use libaspell at all
- fix post-build target to make sure the aspell "en" dictionnary building
process can find all required libs
- add CPPFLAGS and LDFLAGS to CONFIGURE_ENV to that libaspell.la is created
with correct ddependency_libs
3338962afd