[Rpm-maint] [rpm-software-management/rpm] rpm-4.18.0 embeds build machine CPU count (Issue #2343)

[Bernhard M. Wiedemann]

I tried

```diff
===================================================================
--- rpm-4.18.0.orig/platform.in
+++ rpm-4.18.0/platform.in
@@ -57,7 +57,7 @@
         if [ -n "$ncpus_max" ] && [ "$ncpus_max" -gt 0 ] && [ "$RPM_BUILD_NCPUS" -gt "$ncpus_max" ]; then RPM_BUILD_NCPUS="$ncpus_max"; fi; \\\
         echo "$RPM_BUILD_NCPUS";)
 
-%_smp_mflags -j%{_smp_build_ncpus}
+%_smp_mflags -j${RPM_BUILD_NCPUS}
 
 # Maximum number of threads to use when building, 0 for unlimited
 #%_smp_nthreads_max 0
```

But somehow I still get this diff
```diff
-make -j4
+make -j1
```

the produced  `/usr/lib/rpm/platform/x86_64-linux/macros` has
```
%_smp_mflags -j%{_RPM_BUILD_NCPUS}
```

Why is that?

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