Static build support + RTM_NEWLINK race fix

1. CMakeLists.txt: BUILD_STATIC cmake option. When ON, links against
   static libnl-3 archives and sets -static linker flag. Required for
   deploying vwifi-client to OpenWrt DUT (no libnl-3 shared library).

2. cmonwirelessdevice.cc: RTM_NEWLINK race fix. new_net_interface()
   called get_winterface_infos() which does an nl80211 roundtrip on
   wifi.nls — same socket used by winet_update_loop's 1s poll. When
   both hit the socket concurrently, responses get crossed and the
   new interface is permanently lost from _list_winterfaces. Fix:
   call _newinet_cb(inetdevice) directly since RTM_NEWLINK already
   has all needed info (name, ifindex, MAC). No shared socket access.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CMakeLists.txt

@@ -91,7 +91,13 @@ set(COMMON_SOURCES
 
 add_library(vwifi_common STATIC ${COMMON_SOURCES})
 # Link common library dependencies once
+option(BUILD_STATIC "Build static binaries" OFF)
+if(BUILD_STATIC)
+  set(CMAKE_EXE_LINKER_FLAGS "-static")
+  target_link_libraries(vwifi_common PUBLIC Threads::Threads /usr/lib/x86_64-linux-gnu/libnl-genl-3.a /usr/lib/x86_64-linux-gnu/libnl-3.a)
+else()
   target_link_libraries(vwifi_common PUBLIC Threads::Threads PkgConfig::LIBNL3)
+endif()
 
 
 # --- Executables ---

src/cmonwirelessdevice.cc

@@ -323,7 +323,7 @@ void MonitorWirelessDevice::new_net_interface(struct nlmsghdr *h)
 
 	if(inetdevice.checkif_wireless_device()){
 
-		get_winterface_infos(ifi->ifi_index); // we can call a callback here, instead calling it in recv_winterface_infos, to reduce cpu
+		_newinet_cb(inetdevice); // Fix: call directly, skip nl80211 roundtrip (races with winet_update_loop)
 	}
 
 }