build: avoid setting GGML_MAX_NAME when building against external ggml #751
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An external ggml will most likely have been built with the default GGML_MAX_NAME value (64), which would be inconsistent with the value set by our build (128). That would be an ODR violation, and it could easily cause memory corruption issues due to the different sizeof(struct ggml_tensor) values.
For now, when linking against an external ggml, we demand it has been patched with a bigger GGML_MAX_NAME, since we can't check against a value defined only at build time.
Related: #749