ENABLE_XHOST=NO does not work for PGI
Related to #361 (closed).
Actually, it seems pgi compilers default to -tp=host
(see https://www.bu.edu/tech/support/research/software-and-programming/programming/compilers/pgi-compiler-flags/), so it's not enough to pass no flag, one has to pass -tp=px
to disable host-specific compilation.