add cache file option to autoconf executor by default (if cflags and ldflags match default)

src/SPC/util/UnixShell.php

@@ -117,6 +117,11 @@ class UnixShell
         return trim($str);
     }
 
+    public function getEnv(): array
+    {
+        return $this->env;
+    }
+
     private function getExecString(string $cmd): string
     {
         logger()->debug('Executed at: ' . debug_backtrace()[0]['file'] . ':' . debug_backtrace()[0]['line']);
@@ -129,9 +134,4 @@ class UnixShell
         }
         return $cmd;
     }
-
-    public function getEnv(): array
-    {
-        return $this->env;
-    }
 }