Rename android-main.cpp to follow naming conventions

CI/file_name_exceptions.txt

@@ -1,4 +1,3 @@
-apps/openmw/android_main.cpp
 apps/openmw/mwsound/efx-presets.h
 apps/openmw/mwsound/ffmpeg_decoder.cpp
 apps/openmw/mwsound/ffmpeg_decoder.hpp

apps/openmw/CMakeLists.txt

@@ -15,7 +15,7 @@ set(OPENMW_HEADERS
     profile.hpp
 )
 
-source_group(apps/openmw FILES main.cpp android_main.cpp ${OPENMW_SOURCES} ${OPENMW_HEADERS} ${OPENMW_RESOURCES})
+source_group(apps/openmw FILES main.cpp androidmain.cpp ${OPENMW_SOURCES} ${OPENMW_HEADERS} ${OPENMW_RESOURCES})
 
 add_openmw_dir (mwrender
     actors objects renderingmanager animation rotatecontroller sky skyutil npcanimation esm4npcanimation vismask
@@ -127,7 +127,7 @@ if(BUILD_OPENMW)
     if (ANDROID)
         add_library(openmw SHARED
             main.cpp
-            android_main.cpp
+            androidmain.cpp
         )
     else()
         openmw_add_executable(openmw