Remove superfluous .gitignore files

Three files had been omitted when porting the corresponding commit from master

projectfiles/CodeBlocks/.gitignore

@@ -1,7 +0,0 @@
-.objs*
-objs*
-*.depend
-*.layout
-*_build_log.html
-liblua.a
-cb/

projectfiles/Dev-C++/.gitignore

@@ -1,5 +0,0 @@
-Makefile.win
-*_private.h
-*_private.rc
-*_private.res
-wesnoth.layout

src/.gitignore

@@ -1,35 +0,0 @@
-*.swp
-.deps
-.libs
-gmon.out
-wesnoth
-cutter
-exploder
-wesnothd
-CMakeFiles
-campaignd
-cmake_install.cmake
-wesnoth_zip
-Makefile
-Makefile.in
-libcampaignd.a
-libwesnoth_core.a
-libwesnoth_extras.a
-libwesnoth_sdl.a
-libwesnoth-core.a
-libwesnoth-game.a
-libwesnothd.a
-libwesnoth.a
-libwesnoth-lua.a
-revision-stamp
-revision.hpp
-tags
-test
-wesnoth_addon_manager
-wmllint
-wmlscope
-wmlindent
-config.h
-revision.dummy
-#cmake/win32/MSVC:
-*.vcproj