gitignore: Remove pre-.gen filenames

@Noshyaar was right to remove them in the first place,
we need users with local clones to clean them up to prevent
older .cpp files from being including by globbing.

(cherry picked from commit 36548a3fa58f00a3ef301f169f237b5641bdf635)

.gitignore

@@ -1,33 +1,5 @@
 # Godot auto generated files
 *.gen.*
-core/global_defaults.cpp
-core/method_bind_ext.inc
-core/method_bind.inc
-core/script_encryption_key.cpp
-core/version_generated.h
-drivers/gles2/shaders/*.h
-drivers/gles3/shaders/*.h
-drivers/unix/os_unix_global_settings_path.cpp
-editor/authors.h
-editor/builtin_fonts.h
-editor/certs_compressed.h
-editor/doc_data_compressed.h
-editor/editor_icons.cpp
-editor/register_exporters.cpp
-editor/translations.h
-log.txt
-main/app_icon.h
-main/splash.h
-make.bat
-modules/register_module_types.cpp
-platform/android/logo.h
-platform/bb10/logo.h
-platform/iphone/logo.h
-platform/javascript/logo.h
-platform/osx/logo.h
-platform/server/logo.h
-platform/windows/logo.h
-platform/x11/logo.h
 
 # Documentation generated by doxygen or from classes.xml
 doc/_build/