When linking against the prebuilt libcrypto.so.1.0.0 and
libssl.so.1.0.0 there is a problem running the viewer in
gdb (on debian) because gdb links with libpython2.7.so
which needs a newer openssl on my system (OPENSSL_1.0.1).
The patch allows to work around this problem by defining
-DUSE_SYSTEM_OPENSSL:BOOL=ON when configuring, which then
causes the viewer to be compiled against the system libs.
(If you already installed the prebuilt, you have to manually
remove them with script/install.py --uninstall openSSL).
The prebuilt libcurl expects a function SSLv2_client_method
however, which is not present in my openssl system libs.
A stub was added which is possible because the function
in question isn't used anyway.
