Don't build with PHPC 1.x on legacy PHP versions (#1456)

.evergreen/config.yml

@@ -66,6 +66,7 @@ include:
 
   # Automatically generated files
   - filename: .evergreen/config/generated/build/build-extension.yml
+  - filename: .evergreen/config/generated/build/build-extension-next-minor.yml
   - filename: .evergreen/config/generated/test/local.yml
   - filename: .evergreen/config/generated/test/load-balanced.yml
   - filename: .evergreen/config/generated/test/require-api-version.yml

.evergreen/config/generate-config.php

@@ -51,6 +51,7 @@
 
 // Build tasks
 $allFiles[] = generateConfigs('tasks', 'build', 'phpVersion', 'build-extension.yml', $supportedPhpVersions);
+$allFiles[] = generateConfigs('tasks', 'build', 'phpVersion', 'build-extension-next-minor.yml', $modernPhpVersions);
 
 // Test tasks
 $allFiles[] = generateConfigs('tasks', 'test', 'mongodbVersion', 'local.yml', $localServerVersions);

.evergreen/config/templates/build/build-extension-next-minor.yml

@@ -0,0 +1,10 @@
+  - name: "build-php-%phpVersion%-next-minor"
+    tags: ["build", "php%phpVersion%", "next-minor"]
+    commands:
+      - func: "locate PHP binaries"
+        vars:
+          PHP_VERSION: "%phpVersion%"
+      - func: "compile extension"
+        vars:
+          EXTENSION_BRANCH: "v1.x"
+      - func: "upload extension"

.evergreen/config/templates/build/build-extension.yml

@@ -26,13 +26,3 @@
         vars:
           EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
-  - name: "build-php-%phpVersion%-next-minor"
-    tags: ["build", "php%phpVersion%", "next-minor"]
-    commands:
-      - func: "locate PHP binaries"
-        vars:
-          PHP_VERSION: "%phpVersion%"
-      - func: "compile extension"
-        vars:
-          EXTENSION_BRANCH: "v1.x"
-      - func: "upload extension"