Use SRCTOP-relative paths and .CURDIR with :H instead of ".." specified paths

This simplifies pathing in make/displayed output

MFC after: 3 weeks
Sponsored by: Dell EMC Isilon

First pass through library packaging.

Sponsored by: The FreeBSD Foundation

Replace beforeinstall: handling with FILES.

This actually fixes some cases to respect LIBRARIES_ONLY.

Sponsored by: EMC / Isilon Storage Division

Revert r282775 for now. The added dependency would cause problems for
e.g. ports-mgmt/pkg and we would like to do an exp-build.

Requested by: bdrewery

Revert r281372, it's no longer needed after r282726 (fix for PR 199119) as the
symbol conflict between libmd and libcrypto have been solved.

For reasons that I am not understand yet, using the libmd version of
SHA256 would make libarchive based application to give:

archive_read_extract(): Lzma library error: Corrupted input data

(Inter

For reasons that I am not understand yet, using the libmd version of
SHA256 would make libarchive based application to give:

archive_read_extract(): Lzma library error: Corrupted input data

(Internally this is LZMA_DATA_ERR)

However, the libmd version of SHA256 is supposed to give same result
as the bundled version do, and xz(1) is not affected.

As a precaution, revert the SHA256 portion of r281316 for now until
we figure out why it breaks libarchive interoperability as we can't
yet rule out this change have introduced an ABI breakage.

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Do not regenerate and install liblzma.pc when only build libraries
aka do not regenerate while generating 32bits libs

Reported by: antoine

MFC r207842, r207844, r208099:

MFC r207842:
Import of liblzma, xz, xzdec, lzmainfo from vendor branch
Add support for xz and lzma to lesspipe.sh (xzless, lzless)

MFC r207844:
Add two public headers

MFC r207842, r207844, r208099:

MFC r207842:
Import of liblzma, xz, xzdec, lzmainfo from vendor branch
Add support for xz and lzma to lesspipe.sh (xzless, lzless)

MFC r207844:
Add two public headers missing in r207842
Adjust CFLAGS for lzmainfo, xz, xzdec

MFC r208099:
Add versioned symbols to liblzma
Use default SHLIB_MAJOR.

Approved by: delphij (mentor)

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Fix some leftover binaries and shared libraries in the system that still
have an executable stack, due to linking in hand-assembled .S or .s
files, that have no .GNU-stack sections:

RWX --- --- /li

Fix some leftover binaries and shared libraries in the system that still
have an executable stack, due to linking in hand-assembled .S or .s
files, that have no .GNU-stack sections:

RWX --- --- /lib/libcrypto.so.6
RWX --- --- /lib/libmd.so.5
RWX --- --- /lib/libz.so.6
RWX --- --- /lib/libzpool.so.2
RWX --- --- /usr/lib/liblzma.so.5

These were found using scanelf, from the sysutils/pax-utils port.

Reviewed by: kib

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- Add versioned symbols to liblzma
- Use default SHLIB_MAJOR.

Approved by: mm
X-MFC with: lzma library MFC

Add two public headers missing in r207842
Adjust CFLAGS for lzmainfo, xz, xzdec

Approved by: delphij (mentor)
MFC after: 2 weeks