The EFI_IMAGE_SCN_ALIGN_16BYTES flags present in our section
characteristics are not recognised by some versions of Microsoft's
"link.exe" tool.  This may be causing issues with the UEFI Secure Boot
signing "process".  The error reporting mechanism of said "process"
comprises exactly one bit of information stating only that an error
has occurred, and no-one at Microsoft seems to have the faintest clue
as to what the underlying real error may be.

The section alignment flags are not required, since the section
alignment is already included within the various alignment fields in
the PE "optional" header anyway.  Remove the section alignment flags
in the blind hope that this may placate the explanatorily challenged
daemons responsible for Secure Boot signing at Microsoft.

Signed-off-by: Michael Brown <mbrown@fensystems.co.uk>