cmake: remove "embedded libssh2"

Compiling libssh2 into libgit2 directly is madness. If users want to
create a single library that contains libssh2, then they should link a
static library.

CMakeLists.txt

@@ -74,10 +74,6 @@ if(MSVC)
 	# This option must match the settings used in your program, in particular if you
 	# are linking statically
 	option(STATIC_CRT          "Link the static CRT libraries"                      ON)
-
-	# If you want to embed a copy of libssh2 into libgit2, pass a
-	# path to libssh2
-	option(EMBED_SSH_PATH      "Path to libssh2 to embed (Windows)"                OFF)
 endif()
 
 if(NOT CMAKE_CONFIGURATION_TYPES AND NOT CMAKE_BUILD_TYPE)

cmake/SelectSSH.cmake

@@ -27,15 +27,6 @@ elseif(USE_SSH STREQUAL ON OR USE_SSH STREQUAL "libssh2")
 		set(GIT_SSH_LIBSSH2_MEMORY_CREDENTIALS 1)
 	endif()
 
-	if(WIN32 AND EMBED_SSH_PATH)
-		file(GLOB SSH_SRC "${EMBED_SSH_PATH}/src/*.c")
-		list(SORT SSH_SRC)
-		list(APPEND LIBGIT2_DEPENDENCY_OBJECTS ${SSH_SRC})
-
-		list(APPEND LIBGIT2_DEPENDENCY_INCLUDES "${EMBED_SSH_PATH}/include")
-		file(WRITE "${EMBED_SSH_PATH}/src/libssh2_config.h" "#define HAVE_WINCNG\n#define LIBSSH2_WINCNG\n#include \"../win32/libssh2_config.h\"")
-	endif()
-
 	set(GIT_SSH 1)
 	set(GIT_SSH_LIBSSH2 1)
 	add_feature_info(SSH ON "using libssh2")