PYTHON-5008 Do not build c extensions on other hosts

.evergreen/generated_configs/variants.yml

@@ -16,27 +16,35 @@ buildvariants:
     run_on:
       - rhel92-fips
     batchtime: 10080
+    expansions:
+      NO_EXT: "1"
   - name: other-hosts-rhel8-zseries
     tasks:
       - name: .6.0 .standalone !.sync_async
     display_name: Other hosts RHEL8-zseries
     run_on:
       - rhel8-zseries-small
     batchtime: 10080
+    expansions:
+      NO_EXT: "1"
   - name: other-hosts-rhel8-power8
     tasks:
       - name: .6.0 .standalone !.sync_async
     display_name: Other hosts RHEL8-POWER8
     run_on:
       - rhel8-power-small
     batchtime: 10080
+    expansions:
+      NO_EXT: "1"
   - name: other-hosts-rhel8-arm64
     tasks:
       - name: .6.0 .standalone !.sync_async
     display_name: Other hosts RHEL8-arm64
     run_on:
       - rhel82-arm64-small
     batchtime: 10080
+    expansions:
+      NO_EXT: "1"
 
   # Atlas connect tests
   - name: atlas-connect-rhel8-python3.9

.evergreen/scripts/generate_config.py

@@ -758,6 +758,8 @@ def create_alternative_hosts_variants():
         )
     )
 
+    expansions = dict()
+    handle_c_ext(C_EXTS[0], expansions)
     for host_name in OTHER_HOSTS:
         host = HOSTS[host_name]
         variants.append(
@@ -766,6 +768,7 @@ def create_alternative_hosts_variants():
                 display_name=get_display_name("Other hosts", host),
                 batchtime=batchtime,
                 host=host,
+                expansions=expansions,
             )
         )
     return variants