Avoid compiler warnings about implicit function declarations. #488
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Include header that declares functions from the UMFPACK library before using them. Add path to that header to the preprocessor flags.
Also keep similar order of linker flags independent of whether the bundled or an external UMFPACK library is used.
This warning is elevated to an error in LLVM Clang 18 (with default compiler flags). This also errors for GCC 14.