File boost-system.patch of Package gource

diff -purN a/configure.ac b/configure.ac
--- a/configure.ac	2024-06-17 04:14:26.000000000 +0200
+++ b/configure.ac	2025-10-11 15:33:38.618271750 +0200
@@ -47,7 +47,6 @@ AC_CHECK_FUNCS([IMG_LoadJPG_RW], , AC_MS
 
 #BOOST
 AX_BOOST_BASE([1.46], , AC_MSG_ERROR(Boost Filesystem >= 1.46 is required. Please see INSTALL))
-AX_BOOST_SYSTEM
 AX_BOOST_FILESYSTEM
 
 CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"