CMake - How to best include libcurl

[Noam Chitayat via curl-library]

Hey folks!

For the past little while, I've had curl statically linked into a project.
The project Makefile invokes the autoconf script in curl and produces a
static library. I'm now switching to CMake, but running into problems.

My CMakeLists.txt has the following commands:

```
set(HTTP_ONLY ON)
set(CMAKE_USE_OPENSSL OFF)
set(BUILD_CURL_EXE OFF)
set(CURL_STATICLIB ON)
set(CURL_ZLIB OFF)
set(CMAKE_USE_LIBSSH2 OFF)

add_subdirectory(curl)
```

Unfortunately, even with these settings, I get the following
OpenSSL-related error:
```
CMake Error at
/usr/local/Cellar/cmake/3.6.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:148
(message):
  Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
  system variable OPENSSL_ROOT_DIR (missing: OPENSSL_INCLUDE_DIR)
Call Stack (most recent call first):

/usr/local/Cellar/cmake/3.6.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:388
(_FPHSA_FAILURE_MESSAGE)
  /usr/local/Cellar/cmake/3.6.2/share/cmake/Modules/FindOpenSSL.cmake:380
(find_package_handle_standard_args)
  curl/CMakeLists.txt:356 (find_package)
```

I've clearly done something wrong here. Is there documentation or an
example available of a CMakeLists.txt that includes curl as a subdirectory?

Thanks so much for your help,
Noam Chitayat

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