Restructure the native module

Consolidate all code into the src folder

native/src/Application.mk

@@ -0,0 +1,18 @@
+APP_BUILD_SCRIPT := src/Android.mk
+APP_ABI          := armeabi-v7a arm64-v8a x86 x86_64
+APP_CFLAGS       := -Wall -Oz -fomit-frame-pointer -flto
+APP_LDFLAGS      := -flto
+APP_CPPFLAGS     := -std=c++20
+APP_STL          := none
+APP_PLATFORM     := android-21
+APP_THIN_ARCHIVE := true
+APP_STRIP_MODE   := --strip-all
+
+# Busybox should use stock libc.a
+ifdef B_BB
+APP_PLATFORM     := android-24
+APP_LDFLAGS      += -T src/lto_fix.lds
+ifeq ($(OS),Windows_NT)
+APP_SHORT_COMMANDS := true
+endif
+endif