Fix broken overloading of libc close in static OpenWrt build

src/base/files/scoped_file_linux.cc

@@ -81,6 +81,8 @@ bool IsFDOwned(int fd) {
 
 }  // namespace base
 
+#ifndef OPENWRT_BUILD_STATIC
+
 using LibcCloseFuncPtr = int (*)(int);
 
 // Load the libc close symbol to forward to from the close wrapper.
@@ -110,3 +112,5 @@ __attribute__((visibility("default"), noinline)) int close(int fd) {
 }
 
 }  // extern "C"
+
+#endif  // OPENWRT_BUILD_STATIC

src/build/config/openwrt/BUILD.gn

@@ -34,6 +34,7 @@ config("compiler") {
   if (build_static) {
     # Musl static objects are not built with -fPIC, cannot use -static-pie.
     ldflags += [ "-static" ]
+    defines += [ "OPENWRT_BUILD_STATIC" ]
   } else if (current_cpu == "x86") {
     ldflags += [ "-Wl,--dynamic-linker=/lib/ld-musl-i386.so.1" ]
   } else if (current_cpu == "mipsel") {