Reland (again) "Enable the various chrome zlib optimizations."

This reverts commit 5ad12200.

This time we enable the same optimizations on x86/x86-64 as on arm/arm64.

Optimized inflation is disabled because it breaks `atest
CtsLibcoreTestCases:org.apache.harmony.tests.java.util.zip.DeflaterTest`.

This version also distinguishes neon/non-neon builds because the NDK
builds a single libz. I don't trust -mfpu=neon not to cause all kinds of
neon dependencies; I don't think that our HWCAP tests would be
sufficient.

Bug: http://b/149443852
Bug: https://issuetracker.google.com/115695768
Bug: https://issuetracker.google.com/135889247
Change-Id: I283629c481203c6035ec1686b2279fc286c59ea3
Test: boots
Test: zlib_bench scores 2x or more faster on arm/arm64
Test: atest CtsLibcoreTestCases:org.apache.harmony.tests.java.util.zip.DeflaterTest
Test: recovery_unit_test.ApplyPatchModesTest