Move ulimit workaround into yum reqs func

conda_smithy/configure_feedstock.py

@@ -1357,12 +1357,20 @@ def generate_yum_requirements(forge_config, forge_dir):
         yum_build_setup = textwrap.dedent(
             """\
 
+            (
+            # Due to https://bugzilla.redhat.com/show_bug.cgi?id=1537564 old
+            # versions of rpm are drastically slowed down when the number of
+            # file descriptors is very high. This can be visible during a
+            # `yum install` step of a feedstock build.
+            # => Set a lower limit in a subshell for the `yum install`s only.
+            ulimit -n 1024
+
             # Install the yum requirements defined canonically in the
             # "recipe/yum_requirements.txt" file. After updating that file,
             # run "conda smithy rerender" and this line will be updated
             # automatically.
             /usr/bin/sudo -n yum install -y {}
-
+            )
 
         """.format(
                 " ".join(requirements)

conda_smithy/templates/build_steps.sh.tmpl

@@ -62,14 +62,7 @@ setup_conda_rc "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"
 {% if build_setup -%}
 {{ build_setup }}{% endif -%}
 {% if yum_build_setup is defined -%}
-(
-# Due to https://bugzilla.redhat.com/show_bug.cgi?id=1537564 old versions of rpm
-# are drastically slowed down when the number of file descriptors is very high.
-# This can be visible during a `yum install` step of a feedstock build.
-# => Set a lower limit in a subshell for the `yum install`s only.
-ulimit -n 1024
-{{ yum_build_setup }}
-){% endif -%}
+{{ yum_build_setup }}{% endif -%}
 
 # make the build number clobber
 make_build_number "${FEEDSTOCK_ROOT}" "${RECIPE_ROOT}" "${CONFIG_FILE}"