gst/gst-i18n-lib.h: check for ENABLE_NLS, not GETTEXT_PACKAGE

gst/gst-i18n-lib.h: check for ENABLE_NLS, not GETTEXT_PACKAGE

Original commit message from CVS:

* gst/gst-i18n-lib.h:
check for ENABLE_NLS, not GETTEXT_PACKAGE
* gst/gstregistry.c: (gst_registry_add_plugin),
(gst_registry_scan_path_level),
(_gst_registry_remove_cache_plugins):
protect possibly NULL strings
* gst/parse/types.h:
config.h already included before
* tools/gst-inspect.c: (main):
sys/wait.h also doesn´t exist on mingw, so change the ifdef check
check for ENABLE_NLS, not GETTEXT_PACKAGE
* tools/gst-launch.c: (main):
check for ENABLE_NLS, not GETTEXT_PACKAGE

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