ifdef for now webgl

GravRacer, GravHigh, GravMutant, Grav... uhm... shoppamap? Easy! Gravity script could be combined with any other script now.

Fixed build failure to a missing math library linked with BUILD_ENGINE_C=1 and clang webgl

Free cached ammo menu tex on quit.

'-d' option to pas2c webgl

Parse " and \ escaping in binds

rename NOPASCAL option to BUILD_ENGINE_C webgl

fix missing escape for usernick used in regexp

cosmetics webgl

Oops, forgot 'hg add' this file

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