Version bump

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/build.gradle

@@ -20,7 +20,7 @@ android {
         applicationId 'com.wireguard.android'
         minSdkVersion 21
         targetSdkVersion 27
-        versionCode 404
+        versionCode 405
         versionName '0.4.0'
     }
     externalNativeBuild {

app/tools/libwg-go/Makefile

@@ -1,6 +1,6 @@
 containing = $(foreach v,$2,$(if $(findstring $1,$v),$v))
 FILES := $(wildcard ../wireguard-go/*/*.go) $(wildcard ../wireguard-go/*.go)
-FILES := $(filter-out %/main.go $(filter-out %_linux.go,$(call containing,_,$(FILES))),$(FILES)) $(wildcard ../wireguard-go/syscall_linux*.go)
+FILES := $(filter-out %/main.go $(filter-out %_linux.go,$(call containing,_,$(FILES))),$(FILES))
 
 export GOPATH := $(CURDIR)/go
 CLANG_FLAGS := --target=$(ANDROID_LLVM_TRIPLE) --gcc-toolchain=$(ANDROID_TOOLCHAIN_ROOT) --sysroot=$(ANDROID_SYSROOT)