scudo: Fix one of the C wrapper tests on Android.

The test ScudoWrappersCTest.Realloc expects realloc of memalign to work on
Android, but this relies on dealloc_type_mismatch being set to false. Commit
0d3d4d3b caused us to start setting it to true in the C wrapper tests,
which broke the test. Set it to the correct value on Android.

Differential Revision: https://reviews.llvm.org/D71078