Make CPU and thread-related macros available on all platforms

%_smp_mflags and the related macros that it grew around itself used to
be platform specific as they relied on external tooling (eg getconf for
getting processor count), but since rpm 4.15 this has been backed by the
built-in %{getncpus} macro which is available on all platforms, so
there's zero reason to duplicate this stuff on all platform files.

Fixes: rpm-software-management#2265
(cherry picked from commit 5049fc7)

macros.in

@@ -699,6 +699,22 @@ package or when debugging this package.\
 # Macro to fix broken permissions in sources
 %_fixperms      %{__chmod} -Rf a+rX,u+w,g-w,o-w
 
+# Maximum number of CPU's to use when building, 0 for unlimited.
+#%_smp_ncpus_max 0
+
+%_smp_build_ncpus %([ -z "$RPM_BUILD_NCPUS" ] \\\
+	&& RPM_BUILD_NCPUS="%{getncpus}"; \\\
+        ncpus_max=%{?_smp_ncpus_max}; \\\
+        if [ -n "$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}
+
+# Maximum number of threads to use when building, 0 for unlimited
+#%_smp_nthreads_max 0
+
+%_smp_build_nthreads %{_smp_build_ncpus}
+
 #==============================================================================
 # ---- Scriptlet template templates.
 #	Global defaults used for building scriptlet templates.

platform.in

@@ -48,22 +48,6 @@
 
 %_defaultdocdir		%{_datadir}/doc
 
-# Maximum number of CPU's to use when building, 0 for unlimited.
-#%_smp_ncpus_max 0
-
-%_smp_build_ncpus %([ -z "$RPM_BUILD_NCPUS" ] \\\
-	&& RPM_BUILD_NCPUS="%{getncpus}"; \\\
-        ncpus_max=%{?_smp_ncpus_max}; \\\
-        if [ -n "$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}
-
-# Maximum number of threads to use when building, 0 for unlimited
-#%_smp_nthreads_max 0
-
-%_smp_build_nthreads %{_smp_build_ncpus}
-
 #==============================================================================
 # ---- Build policy macros.
 #