Suppress non-critical warnings in external/lmfit.

* We should enable those warnings after fixing the upstream source code.

Bug: 64487164
Test: build with WITH_TIDY=1

Change-Id: Id8645ccfea886e0d391c8829fbef6fdf33b38d8f
Merged-In: Id8645ccfea886e0d391c8829fbef6fdf33b38d8f
(cherry picked from commit b1e3bd9c344025ce81b94202a273fcd3286e4258)
1 file changed