[Rpm-maint] [rpm-software-management/rpm] Macro %-x modifies original flag if argument follows without intervening space (Issue #2454)

[Ralf Habacker]

See the following example:
```
$rpm --version
RPM version 4.14.3

$ rpm --define '%foo(b:) %{-b}' --eval '%foo -b2'
-b 2
```
The macro adds a space between flag and argument, which may affect passing to applications as shown by the following example:

```
$ python3 -bb
Python 3.6.15 (default, Sep 23 2021, 15:41:43) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
<CTRL-D>
``` 
Passing the option through a rpm macro returns: 
```
$ rpm --define '%foo(b:) python3 %{-b}' --eval '%foo -bb` 
python3 -b b
```
Running the generated command fails: 
```
$`rpm --define '%foo(b:) python3 %{-b}' --eval '%foo -bb'` 
python3: can't open file 'b': [Errno 2] No such file or directory
```


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