add libssh

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

libs/libssh/patches/002-disable-libssp.patch

@@ -0,0 +1,22 @@
+--- a/cmake/Modules/DefineCompilerFlags.cmake
++++ b/cmake/Modules/DefineCompilerFlags.cmake
+@@ -1,7 +1,6 @@
+ # define system dependent compiler flags
+ 
+ include(CheckCCompilerFlag)
+-include(CheckCCompilerFlagSSP)
+ 
+ if (UNIX AND NOT WIN32)
+     #
+@@ -21,11 +20,6 @@ if (UNIX AND NOT WIN32)
+             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+         endif (WITH_FPIC)
+ 
+-        check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
+-        if (WITH_STACK_PROTECTOR)
+-            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstack-protector")
+-        endif (WITH_STACK_PROTECTOR)
+-
+         if (CMAKE_BUILD_TYPE)
+             string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
+             if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))