Make the alignof() usage more portable in grep(1)

Remove NetBSD specific check and replace it with GCC extension __alignof__
that is available since GCC 2.x.

Requested by <kre>

Avoid Undefind Behavior in DEFAULT_ALIGNMENT in GNU grep(1)

Replace homegrown logic of calculating alignment with alignof, a C11 header
feature.

Add a check for NetBSD >= 8.0 just in case that some

Avoid Undefind Behavior in DEFAULT_ALIGNMENT in GNU grep(1)

Replace homegrown logic of calculating alignment with alignof, a C11 header
feature.

Add a check for NetBSD >= 8.0 just in case that someone will want to build
it on older NetBSD.

Issue detected with UBSan.

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Import latest GPLv2 grep