ParseImplicitIncludeInfo: handle/add SunPro, XL, and -nostdinc test cases

Add parser code for compiler IDs SunPro and XL.  For SunPro, /usr/include
appears to be hardwired in and it does not have a -nostdinc-type flag.

For XL, the "xlc" and "xlC" commands determine if you are C or C++
based on input filename.  So compiling x.c with "xlC" reverts to C
and compiling x.cc with "xlc" upgrades to CXX.  System include paths
are specified by:
  -qc_stdinc=[path] and -qgcc_c_stdinc=[path] (for C)
  -qcpp_stdinc=[path] and -qgcc_cpp_stdinc=[path] (for CXX)
If you specify "-qnostdinc" then the above flags are ignored.
Specifying an empty path reverts the value to the default
path (e.g. "-qgcc_c_stdinc=" reverts that to the default).

Adjust the code to handle parsing the case where the user specifies
additional compiler include flags via CMAKE_C_FLAGS/CMAKE_CXX_FLAGS.
For example: "-DCMAKE_C_FLAGS=-nostdinc" ... note that gcc and clang
output slightly differ when -nostdinc is specified (clang skips
printing 'search starts here:' with the angle brackets, gcc always
prints it).

Enable sunos-{C,CXX}-SunPro test cases and add XL test cases.
Also add a few -nostdinc style tests.

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