We need to provide a better match to what a call to
find_package(OpenSSL) gives, to make the builtin work
with CMake 3.9.

Revert "Updating Zlib/Cloudflare/CMS-externals to latest version (SIMD), together with new updates from Cloudflare (support of aarch64 and MSVC)"

This reverts commit c3bb0c282f6e8708bd42bb527ede2d5af53edb2b.

This reverts commit 7abae9cb4ea493c7e897e756689ccf0133bf15ed.

This reverts commit 8374c3c949c579e48c15575e804d314151fa25f9.

This reverts commit f028b5f5f85a4ebae9e69b9509a4ad9f55477707.

This reverts commit 5ed407d35cf205db7a648ccbecd15618f6a11ec0.

Revert "Refactoring deflate.c to support more compilation cases (x86_64[SIMD/nonSIMD], Aarch64[Neon/CRC32], Windows)"

This reverts commit cdb3ef83aeda1638b8f769a2d8be2693933ceb99.

This reverts commit 71116468507ddfa06264b4d4e83826a5f272ffc8.

Revert "Fixing compilation on Mac OS X: the implementation of target attribute is using the STT_GNU_IFUNC symbol type, disabling its usage in zlib for Mac"

This reverts commit 63345dab49441fdf6f9098ce797c7802816e6326.

This reverts commit c168486449b665e7191bc6f729f802c68e7ecd90.

Revert "Adding CMake macro checking version of binutils for correct handling of zlib compilation on SL6"

This reverts commit 531f493ac0b7cb11c8f829d483b7d0afbf08ad9c.

This reverts commit dd464d715abf89faea271e93cb455ae667fb1aa8.

We link the builtin static libraries with hidden symbols into our
shared libraries, so we need the builtins to be compiled with -fPIC.

This reverts commit 2ecf45e5, and
makes some extra adjustments for Davix 0.6.7 to build or provide
a clear error if something is missing in the system.

This reverts commit 371e3504.
The new version of Davix has problems on some platforms with
libuuid. Reverting until a proper solution is found that works
everywhere.

Davix uses clock_gettime(), which was moved from librt to libc in
glibc 2.17. Therefore, on old systems (e.g. SLC6), we may need to add
-lrt when linking libraries using Davix.

OpenSSL needs -ldl, but does not propagate that properly, so
when linked statically into Davix, there are missing symbols:

builtins/davix/DAVIX-prefix/lib/libdavix.a(davixcontext.cpp.o):
	In function `Davix::LibPath::LibPath()':
builtins/davix/DAVIX-prefix/src/DAVIX/src/davixcontext.cpp:154:
	undefined reference to `dladdr'
builtins/openssl/OPENSSL-prefix/lib/libcrypto.a(dso_dlfcn.o):
	In function `dlfcn_globallookup':
dso_dlfcn.c:(.text+0x11): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x24): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x2f): undefined reference to `dlclose'

Therefore we need to add ${CMAKE_DL_LIBS} to the Davix::Davix
imported target so that -ldl gets added when linking to Davix.
We can then remove the ${SYSLIBS} from RDAVIX, which had this
role before.

The problem was in crc32-pclmul_asm.S that is licensed under GPL, while ROOT has LGPL. ROOT compression performance stay the same.

Fixing compilation on Mac OS X: the implementation of target attribute is using the STT_GNU_IFUNC symbol type, disabling its usage in zlib for Mac

Refactoring deflate.c to support more compilation cases (x86_64[SIMD/nonSIMD], Aarch64[Neon/CRC32], Windows)

Updating Zlib/Cloudflare/CMS-externals to latest version (SIMD), together with new updates from Cloudflare (support of aarch64 and MSVC)

Rebase of https://github.com/cms-externals/zlib/tree/cms/v1.2.11 (822f7f5a8c57802faf8bbfe16266be02eff8c2e2)
onto https://github.com/cloudflare/zlib/tree/gcc.amd64 (f04f4ed63ae039f1d1bc5c0e3a57aa66e1e2cd6)
adapted for ROOT needs

This is necessary because LLVM depends on ZLIB, for example, and its
build system is such that the dependency is not caught by CMake when
builtin_zlib=ON.