Since `rpm` uses a call to `getopt` to process the command line, I checked the
parameter list with the command line tool `getopt`.
$ getopt -o "D:" -- -D11 -D 22 -D "33" -D "44 55" -D "66 77"
-D '11' -D '22' -D '33' -D '44 55' -D '66 77' --
which gave the expected results (apart from adding an extra space between the
flag and the value).
Running `getopt` with gdb and inspecting the argv array
```
Breakpoint 1, main (argc=11, argv=0x7fffffd7d8) at misc-utils/getopt.c:369
369 struct getopt_control ctl = {
(gdb) p argv[8]
$10 = 0x7fffffdd66 "-D44 55"
(gdb) p argv[9]
$11 = 0x7fffffdd6e "-D"
(gdb) p argv[10]
$12 = 0x7fffffdd71 "66 77"
(gdb)
```
shows that the quoting is done by the shell and not by getopt itself. The
conclusion is that something similar must be done before calling getopt in rpm
to process macro parameters with quotes.
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