Add libjwt and remove gnutls-openssl wrapper

cmake/Modules/FindLibJWT.cmake

@@ -0,0 +1,28 @@
+include(FindPackageHandleStandardArgs)
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBJWT QUIET libjwt)
+
+find_path(LIBJWT_INCLUDE_DIR
+  NAMES jwt.h
+  HINTS ${PC_LIBJWT_INCLUDEDIR} ${PC_LIBJWT_INCLUDE_DIRS}
+  )
+
+find_library(LIBJWT_LIBRARY
+  NAMES jwt-gnutls libjwt-gnutls liblibjwt-gnutls
+  HINTS ${PC_LIBJWT_LIBDIR} ${PC_LIBJWT_LIBRARY_DIR}
+  )
+
+find_package_handle_standard_args(LibJWT
+  REQUIRED_VARS LIBJWT_INCLUDE_DIR LIBJWT_LIBRARY
+  )
+
+if(LIBJWT_FOUND)
+  add_library(libjwt STATIC IMPORTED GLOBAL)
+  set_target_properties(libjwt PROPERTIES
+    IMPORTED_LOCATION "${LIBJWT_LIBRARY}"
+    INTERFACE_INCLUDE_DIRECTORIES "${LIBJWT_INCLUDE_DIR}"
+    )
+endif()
+
+mark_as_advanced(LIBJWT_INCLUDE_DIR LIBJWT_LIBRARY)