buildroot

pkg-cmake.mk: export the fortran compiler path in the CMake toolchain file

Since the fortran support is conditional, only enable it when needed.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Cc: Benjamin Kamath <bkamath@spaceflight.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>