configure: option to separately remove objects from build

Those listed in ULTRAGRID_OBJS, eg. in case of some problem - this was
not possible without --disable-all, which however removes everything,
which is not what is desired if removing some obj for incompatibility (eg
aes67 needing std::to_chars not supported on ancient macOS C++ libraries).

Author: MartinPulec

configure.ac

@@ -3584,6 +3584,15 @@ if test "$build_default" != no || test "$req_files" = all; then
         "
 fi
 
+AC_ARG_WITH(object-remove,
+        AS_HELP_STRING([--with-object-remove], [remove and object (delimit more with '|')]),
+        [removed_files=$withval],
+        [removed_files=])
+
+if test -n "$removed_files"; then
+        ULTRAGRID_OBJS=$(echo "$ULTRAGRID_OBJS" | grep -Ev "$removed_files")
+fi
+
 # -------------------------------------------------------------------------------------------------
 # We need to add libraries then
 # -------------------------------------------------------------------------------------------------