obs-outputs: Add USE_SSL option (disabled by default)

Closes jp9000/obs-studio#487

plugins/obs-outputs/CMakeLists.txt

@@ -1,5 +1,25 @@
 project(obs-outputs)
 
+option(USE_SSL "Enable rtmps support with OpenSSL" OFF)
+
+if (USE_SSL)
+	find_package(SSL QUIET)
+	find_package(ZLIB QUIET)
+endif()
+
+if (SSL_FOUND AND ZLIB_FOUND)
+	add_definitions(-DCRYPTO -DUSE_OPENSSL)
+	include_directories(${SSL_INCLUDE_DIRS} ${ZLIB_INCLUDE_DIRS})
+else()
+	if (USE_SSL)
+		message(WARNING "SSL enabled by user, but OpenSSL was not found")
+	endif()
+	unset(SSL_LIBRARIES)
+	unset(ZLIB_LIBRARIES)
+	add_definitions(-DNO_CRYPTO)
+endif()
+
+
 if(WIN32)
 	set(obs-outputs_PLATFORM_DEPS
 		ws2_32
@@ -58,6 +78,8 @@ add_library(obs-outputs MODULE
 	${obs-outputs_librtmp_HEADERS})
 target_link_libraries(obs-outputs
 	libobs
+	${SSL_LIBRARIES}
+	${ZLIB_LIBRARIES}
 	${obs-outputs_PLATFORM_DEPS})
 
 install_obs_plugin_with_data(obs-outputs data)

plugins/obs-outputs/librtmp/rtmp.h

@@ -25,8 +25,6 @@
  *  http://www.gnu.org/copyleft/lgpl.html
  */
 
-#define NO_CRYPTO 1
-
 #if !defined(NO_CRYPTO) && !defined(CRYPTO)
 #define CRYPTO
 #else