mapi: Make private copies of name strings provided by client.

glXGetProcAddress("glFoo") ends up in stub_add_dynamic() to
create dynamic stubs for dynamic functions. stub_add_dynamic()
doesn't store the caller provided name string "Foo" in a mesa
private copy, but just stores a pointer to the "glFoo" string
passed to glXGetProcAddress - a pointer into arbitrary memory
outside mesa's control.

If the caller passes some dynamically allocated/changing
memory buffer to glXGetProcAddress(), or the caller gets unmapped
from memory, e.g., some dynamically loaded application
plugin which uses OpenGL, this ends badly - with a dangling
pointer.

strdup() the name string provided by the client to avoid
this problem.

Cc: "10.3 10.4 10.5" <[email protected]>
Signed-off-by: Mario Kleiner <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

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