[LLDB][ThreadELFCore] Set all the properties of ELFLinuxSigInfo to a non build dependent size (#117604)

On #110065 the changes to LinuxSigInfo Struct introduced some variables
that will differ in size on 32b or 64b. I've rectified this by setting
them all to build independent types.

GitOrigin-RevId: 4ab298b5fbc8f48387062b2dd99ea07127c02e6b
1 file changed