Avoid "uninitialized memory" error in gl_draw

As discussed in fltk.general, valgrind reported errors when gl_draw()
is called and the text is converted to a texture (i.e. when testing
whether the texture already exists).

We need a length check to make sure we don't overrun text buffers.

See threads "gl_draw" and "gl_draw - [General Use]", respectively,
started on Jun 19, 2019.

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