Fix issue with OSX shader compiler not implementing #if correctly (nice job, Timmy).

indra/llinventory/llsettingssky.cpp

indra/llrender/llrendertarget.cpp

indra/newview/app_settings/settings.xml

...a/newview/app_settings/shaders/class1/deferred/moonF.glsl

indra/newview/app_settings/shaders/class1/deferred/skyF.glsl

.../newview/app_settings/shaders/class1/deferred/waterF.glsl

...wview/app_settings/shaders/class1/environment/waterF.glsl

indra/newview/lldrawpoolwlsky.cpp

indra/newview/llpaneleditwater.cpp

indra/newview/llviewerdisplay.cpp

indra/newview/llviewerwindow.cpp