glsl: fall back to inexact function-match

In GLES, we currently either need an exact match with a local function,
or an exact match with a builtin.

However, if we add support for implicit conversions for GLES shaders,
we also need to fall back to a non-exact match in the case where there
were no builtin match either.

Luckily, we already have a variable ready with this, so let's just
return it if the builtin-search failed.

Signed-off-by: Erik Faye-Lund <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>

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