Stop consuming devel/argp-standalone

Index: src/csync/ConfigureChecks.cmake
--- src/csync/ConfigureChecks.cmake.orig
+++ src/csync/ConfigureChecks.cmake
@@ -14,7 +14,7 @@ set(BINARYDIR ${CMAKE_CURRENT_BINARY_DIR})
 set(SOURCEDIR ${CMAKE_CURRENT_SOURCE_DIR})
 
 # HEADER FILES
-check_include_file(argp.h HAVE_ARGP_H)
+#check_include_file(argp.h HAVE_ARGP_H)
 
 # FUNCTIONS
 if (NOT LINUX)