[Rpm-maint] [rpm-software-management/rpm] Macro file comment loading "regression" (#1659)

[Michael Schroeder]

If you don't mind rdcl() reaching an even higher level of ugliness, an easy fix
is to add
```
        if (p == buf) {
            while (*p && isblank(*p))
                p++;
            if (*p != '%') {
                *q = '\0';              /* trim trailing \r, \n */
                break;
            }    
        }
```
right before the `for (; p < q; p++) {` loop.

This only does the "add continuation lines" magic for real macro definitions.

A different thing to consider is if we want to revert the "empty line ends macro definition"
change, just to make runaway macros not wreck havoc.


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