Fix redefinition of FAILED

[dg0yt]

https://dev.azure.com/martinkroeker/martinkroeker/_build/results?buildId=1472&view=logs&j=0f344e18-ca8b-5780-26f4-6ba48d8d5454&t=33e34d53-76bc-5543-18c4-9ff7691b1623:

In file included from c_sblas1.c:10:
cblas_test.h:18: warning: "FAILED" redefined
   18 | #define  FAILED         0
      | 
In file included from C:/mingw64/x86_64-w64-mingw32/include/winbase.h:2811,
                 from C:/mingw64/x86_64-w64-mingw32/include/windows.h:70,
                 from ../common.h:119,
                 from c_sblas1.c:9:
C:/mingw64/x86_64-w64-mingw32/include/winerror.h:2235: note: this is the location of the previous definition
 2235 | #define FAILED(hr) ((HRESULT)(hr) < 0)

The more invasive alternative is to use a unique prefix.

[martin-frbg]

I think this is only ever used in the local ctest/c_xerbla.c file, so changing this to TEST_FAILED or whatever should also be reasonable. (The same problem probably exists in the Reference-LAPACK source from which these tests were originally taken)