stunnel FIPS install notes

Only dynamic linking of the FIPS-enabled OpenSSL is currently supported, i.e. FIPS-enabled OpenSSL has to be configured with "shared" parameter.
FIPS mode is autodetected if possible. It can be forced with: ./configure --enable-fips or disable with: ./configure --disable-fips

On 32-bit Windows install one of the following compilers:
- MSVC 8.0 (VS 2005) Standard or Professional Edition
- MSVC 9.0 (VS 2008) any edition including Express Edition
On 64-bit Windows install one of the following compilers:
- MSVC 8.0 (VS 2005) Standard or Professional Edition
- MSVC 9.0 (VS 2008) Standard or Professional Edition
Build FIPS-compliant OpenSSL DLLS according to: https://www.openssl.org/docs/fips/UserGuide-2.0.pdf
Build stunnel normally with MSVC or Mingw. Mingw build requires DLL stubs. Stubs can be built with: dlltool --def ms/libeay32.def --output-lib libcrypto.a dlltool --def ms/ssleay32.def --output-lib libssl.a