libelf: Mark both fsize and msize with const attribute.

GCC9 -Wmissing-attributes pointed out that although we alias the fsize
and msize functions only fsize was marked as const. Fix by also marking
the msize definition as const.

https://sourceware.org/bugzilla/show_bug.cgi?id=23884

Signed-off-by: Mark Wielaard <mark@klomp.org>
2 files changed