csmock: force reinstall of module-build-macros

If a build with the same NVR is installed from the default build
repository, we need to uninstall it first, to force its installation
from our local build repository (obtained by bld2repo).

py/csmock

@@ -323,7 +323,8 @@ echo \"$self_pid\" > \"$lock_file\"'" \
             cmd_add += ["--addrepo", url]
 
         if re.match("^.*\\.module\\+el.*\\.src\\.rpm$", srpm):
-            # we need to install "module-build-macros" first for a modular build
+            # we need to reinstall "module-build-macros" first for a modular build
+            self.exec_mock_cmd(["--remove", "module-build-macros"], quiet=quiet)
             cmd = ["--install", "module-build-macros"] + cmd_add
             self.exec_mock_cmd(cmd, quiet=quiet)