coff: Fix section alignment computation
coff: Fix section alignment computation

Section alignment is broken due to not being
direct "align -> power of two set" mapping but
rather including second addition operation.

Fix it by introducing coff_sectalign_flags helper.
This also allow us to use this helper for getting
rid of open coded computation as well.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@gmail.com>

letolabs/nasm,projedi/nasm,projedi/nasm,Distrotech/nasm,projedi/nasm,techkey/nasm,turingstudio/nasm,projedi/nasm,techkey/nasm,turingstudio/nasm,letolabs/nasm,letolabs/nasm,Distrotech/nasm,techkey/nasm,Distrotech/nasm,turingstudio/nasm,Distrotech/nasm,techkey/nasm,turingstudio/nasm,techkey/nasm,projedi/nasm