[backport] fixes #23796; remove extra indirection for args in importc'ed functions in cpp (#23800)

fixes #23796

(cherry picked from commit 1dcc364cd2)

tests/ccgbugs/t23796.nim

@@ -0,0 +1,25 @@
+discard """
+    targets: "c cpp"
+"""
+
+# bug #23796
+
+{.emit: """
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void fooArr(float data[3]) {}
+void fooIntArr(int id, float data[3]) {}
+
+#ifdef __cplusplus
+}
+#endif
+""".}
+
+proc fooArr(data: var array[3, cfloat]) {.importc.}
+proc fooIntArr(id: cint, data: var array[3, cfloat]) {.importc, nodecl.}
+
+var arr = [cfloat 1, 2, 3]
+fooArr(arr)
+fooIntArr(1, arr)