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The include guards have been changed to the filename in uppercase
letters with all non-alphanumeric symbols replaced by underscore.
This include guard pattern matches the guard that is used for the
generated file rocsolver-export.h.

There are two reasons for this:
1. The C and C++ standards reserve all identifiers that begin with
   underscore followed by a capital letter [C99 §7.1.3]
   [C++11 §17.6.4.3.2].
2. In user-visible code, the rocSOLVER library should prevent name
   conflicts by only using identifiers that begin with `rocblas`,
   `ROCBLAS`, `rocsolver` or `ROCSOLVER`.