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This reverts commit 6eae62b0.
This reverts commit baa1f625.

Leaves in the removal of -w from the darwin LDFLAGS as it is still
problematic on 1.9.5 and 1.10.1.

cgo starts exiting when pkg-config doesn't work, so limit calling
pkg-config to linux and windows.

we also need to specify -lssl and -lcrypto in the linker flags
when we don't have pkg-config

this way if you don't have openssl@1.1 installed, it doesn't complain at you

- created a uniform shim layer for the Go code to invoke that does the
  right thing depending on the version of openssl. functions that have
  yet to be moved can be done so as needed.

- fixed the incorrect use of X509_STORE_CTX_get_app_data in verify_cb to
  pull out the SSL object from the x509 store context, which causes
  crashes when the SSL object index happens to not be zero.

- fix engine not being passed to HMAC_Init_ex

- fix HMAC tests not checking for failures with NewHMAC

Change-Id: I1599b4585850d81d4bc43dc067321af15ad3fafd

On Fedora 23, the build fails like this:

	go build
	# github.com/spacemonkeygo/openssl
	/usr/bin/ld: $WORK/github.com/spacemonkeygo/openssl/_obj/cert.cgo2.o: undefined reference to symbol 'EVP_dss1@@libcrypto.so.10'
	/usr/lib64/libcrypto.so.10: error adding symbols: DSO missing from command line
	collect2: error: ld returned 1 exit status

Adding "libcrypto" to the linker flags fixes the issue.

We know that they've decided that OpenSSL is deprecated and the huge
list of warnings obscures any useful ones about the code we're actually
trying to build.

Change-Id: I6596c63c7c3b4509ac01c57a37ed1279991da8dc

Change-Id: I4642fb9b97256ec6b3ffbe403272efc690bf1606

[katamari commit: ce8d2d36f887ab400c77a4eed9e37d02ecc8968a]

[katamari commit: f3af94e720239e8b417b04d73f7460818b9aedf7]

[katamari commit: 77dd3ea8a00bdc73be495e9b06c491a85b4521ff]