modules/rpm: use rpmbuilddir instead of build dir

because some of projects using `build` directory for internal use

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

modules/rpm.py

@@ -71,16 +71,16 @@ class RPMModule:
             fn.write('\n')
         fn.write('%prep\n')
         fn.write('%autosetup\n')
-        fn.write('rm -rf build && mkdir build\n')
+        fn.write('rm -rf rpmbuilddir && mkdir rpmbuilddir\n')
         fn.write('\n')
         fn.write('%build\n')
-        fn.write('pushd build\n')
+        fn.write('pushd rpmbuilddir\n')
         fn.write('  meson ..\n')
         fn.write('  ninja-build -v\n')
         fn.write('popd\n')
         fn.write('\n')
         fn.write('%install\n')
-        fn.write('pushd build\n')
+        fn.write('pushd rpmbuilddir\n')
         fn.write('  DESTDIR=%{buildroot} ninja-build -v install\n')
         fn.write('popd\n')
         if len(to_delete) > 0: