Add missing headers for musl (#330)

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

Co-authored-by: Tindy X <49061470+tindy2013@users.noreply.github.com>

src/generator/config/nodemanip.h

@@ -3,6 +3,7 @@
 
 #include <string>
 #include <vector>
+#include <limits.h>
 #include <quickjspp.hpp>
 
 #include "../../parser/config/proxy.h"

src/utils/file.h

@@ -2,6 +2,7 @@
 #define FILE_H_INCLUDED
 
 #include <string>
+#include <string.h>
 
 #ifdef _WIN32
 #include <unistd.h>