(Linux) Build script improvement: ability to disable WIFI functionali…

…ty (skipping "libiw-dev")

Currently, Wireless Tools (package "libiw-dev") needs to be available on the build machine.
We need it for the WIFI functionality being included in the daemon.

Some users may face issues building daemon due to missing "libiw-dev" on their systems.

So, now there is the possibility to skip using "libiw-dev" and disable WIFI functionality from the daemon build.
Environment variable `IVPN_NO_WIFI` must be defined for that.

Example:
```
  cd desktop-app/daemon/References/Linux/scripts/
  IVPN_NO_WIFI=true ./build-daemon.sh
```

#345

daemon/References/Linux/scripts/build-daemon.sh

@@ -75,13 +75,20 @@ fi
 # Build
 cd $SCRIPT_DIR/../../../
 
+BUILDTAG_DEBUG=""  # "debug"
+BUILDTAG_NOWIFI="" # "nowifi"
+
 if [[ "$@" == *"-debug"* ]]
 then
-    echo "Compiling in DEBUG mode"
-    go build -buildmode=pie -tags debug -o "$OUT_FILE" -trimpath -ldflags "-X github.com/ivpn/desktop-app/daemon/version._version=$VERSION -X github.com/ivpn/desktop-app/daemon/version._commit=$COMMIT -X github.com/ivpn/desktop-app/daemon/version._time=$DATE"
-else
-    go build -buildmode=pie -o "$OUT_FILE" -trimpath -ldflags "-s -w -X github.com/ivpn/desktop-app/daemon/version._version=$VERSION -X github.com/ivpn/desktop-app/daemon/version._commit=$COMMIT -X github.com/ivpn/desktop-app/daemon/version._time=$DATE"
+  echo "[!] Compiling in DEBUG mode."
+  BUILDTAG_DEBUG="debug"
 fi
+if [ ! -z "$IVPN_NO_WIFI" ]; then
+  echo "[!] WIFI functionality DISABLED."
+  BUILDTAG_NOWIFI="nowifi"
+fi
+
+go build -buildmode=pie -tags "${BUILDTAG_DEBUG} ${BUILDTAG_NOWIFI}" -o "$OUT_FILE" -trimpath -ldflags "-X github.com/ivpn/desktop-app/daemon/version._version=$VERSION -X github.com/ivpn/desktop-app/daemon/version._commit=$COMMIT -X github.com/ivpn/desktop-app/daemon/version._time=$DATE"
 
 echo "Compiled binary: '$OUT_FILE'"
 

daemon/wifiNotifier/wifiNotifier_linux.go

@@ -11,7 +11,7 @@ package wifiNotifier
 // 2) comment '#include "iwlib_2_linux.c"'
 // 3) remove  suffix '_2' from function names (in this file): iw_get_range_info_2, iw_init_event_stream_2, iw_extract_event_stream_2
 // #cgo LDFLAGS: -liw
-#include "iwlib_2_linux.c"
+#include "linux_lib/iwlib_2_linux.c"
 
 #include <stdio.h>  // printf
 #include <string.h> // strndup prototype