[Rpm-maint] [rpm-software-management/rpm] RFE: export preamble tags as macros (#1753)

[mikhailnov]

And I cannot add exporting macros easily like:

```diff
diff --git a/build/parsePreamble.c b/build/parsePreamble.c
index ac3d9159e..1e3c55a1b 100644
--- a/build/parsePreamble.c
+++ b/build/parsePreamble.c
@@ -1048,6 +1048,7 @@ static int findPreambleTag(rpmSpec spec,rpmTagVal * tag,
 	    rpmlog(RPMLOG_WARNING, _("line %d: %s is deprecated: %s\n"),
 			spec->lineNum, p->token, spec->line);
 	}
+	rpmPushMacro(NULL, p->token, NULL, spec->line, RMIL_GLOBAL);
 	break;
     }
     if (p == NULL || p->token == NULL)
```

because:

1. BuildRequires can be formed from multiple preamble lines
2. `spec->line` will be not the value of the tag here

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