feat(add c implementation): add math/base/special/cflipsignf

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Author: vivekmaurya001

lib/node_modules/@stdlib/math/base/special/cflipsignf/manifest.json

@@ -24,7 +24,7 @@
       "relative": false
     }
   ],
-	"confs": [
+  "confs": [
     {
       "task": "build",
       "src": [