internal/build:compile with c mode,when c file

runtime/internal/clite/openssl/_wrap/openssl.c

@@ -1,9 +1,5 @@
 #include <openssl/crypto.h>
 
-extern "C" {
-
 void opensslFree(void *ptr) {
     OPENSSL_free(ptr);
 }
-
-}

runtime/internal/clite/openssl/openssl.go

@@ -25,7 +25,7 @@ import (
 // -----------------------------------------------------------------------------
 
 const (
-	LLGoFiles   = "$(pkg-config --cflags openssl): _wrap/openssl.cpp"
+	LLGoFiles   = "$(pkg-config --cflags openssl): _wrap/openssl.c"
 	LLGoPackage = "link: $(pkg-config --libs openssl); -lssl -lcrypto"
 )