Added new FindGNUTLS cmake module

cmake/Modules/FindGNUTLS.cmake

+# - Find gnutls
+# Find the native GNUTLS includes and library
+#
+#  GNUTLS_FOUND - True if gnutls found.
+#  GNUTLS_INCLUDE_DIRS - where to find gnutls.h, etc.
+#  GNUTLS_LIBRARIES - List of libraries when using gnutls.
+
+if (GNUTLS_INCLUDE_DIRS)
+  set(GNUTLS_FIND_QUIETLY TRUE)
+endif (GNUTLS_INCLUDE_DIRS)
+
+# Include dir
+find_path(GNUTLS_INCLUDE_DIR
+	NAMES
+	  gnutls.h
+	  gnutls/gnutls.h
+)
+
+# Library
+find_library(GNUTLS_LIBRARY 
+  NAMES gnutls
+)
+
+# handle the QUIETLY and REQUIRED arguments and set GNUTLS_FOUND to TRUE if 
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(GNUTLS DEFAULT_MSG GNUTLS_LIBRARY GNUTLS_INCLUDE_DIR)
+
+IF(GNUTLS_FOUND)
+  SET( GNUTLS_LIBRARIES ${GNUTLS_LIBRARY} )
+ELSE(GNUTLS_FOUND)
+  SET( GNUTLS_LIBRARIES )
+ENDIF(GNUTLS_FOUND)
+
+# Lastly make it so that the GNUTLS_LIBRARY and GNUTLS_INCLUDE_DIR variables
+# only show up under the advanced options in the gui cmake applications.
+MARK_AS_ADVANCED( GNUTLS_LIBRARIES GNUTLS_INCLUDE_DIRS )