CryptoPkg: add .gitignore for OpenSSL source files

CryptoPkg: add .gitignore for OpenSSL source files

Add a .gitignore that masks the OpenSSL header files under
Include/openssl and the OpenSSL source files under
Library/OpensslLib/openssl-*. This prevents Git from considering
any of these files for addition, and prevents other clutter in
the git status output.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Qin Long <qin.long@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17647 6f19259b-4bc3-4df7-8a09-765794883524