Allow for vendor prefixes in a list test

[lanza]

Summary

Preprocessor/init.c contains a line that explicitly checks for the
string

VERSION "Clang{{.*}}

It's valid to have a toolchain configured to emit a vendor prefix
before the word Clang. e.g.

VERSION "Vendor Clang{{.*}}

[compnerd]

Yeah, that makes sense, the common path uses {{.*}} as the value itself is uninteresting.

[lanza]

rebase

test/Preprocessor/init.c

 // SPARC:#define __UINT_LEAST16_TYPE__ unsigned short
 // SPARC:#define __UINT_LEAST32_MAX__ 4294967295U
 // SPARC:#define __UINT_LEAST32_TYPE__ unsigned int
 // SPARC:#define __UINT_LEAST64_MAX__ 18446744073709551615ULL
 // SPARC:#define __UINT_LEAST64_TYPE__ long long unsigned int
 // SPARC:#define __UINT_LEAST8_MAX__ 255
 // SPARC:#define __UINT_LEAST8_TYPE__ unsigned char
 // SPARC:#define __USER_LABEL_PREFIX__
-// SPARC:#define __VERSION__ "Clang{{.*}}
+// SPARC:#define __VERSION__ "{{.*}}Clang{{.*}}
 // SPARC:#define __WCHAR_MAX__ 2147483647
 // SPARC:#define __WCHAR_TYPE__ int
 // SPARC:#define __WCHAR_WIDTH__ 32
 // SPARC:#define __WINT_TYPE__ int
 // SPARC:#define __WINT_WIDTH__ 32
 // SPARC:#define __sparc 1
 // SPARC:#define __sparc__ 1
 // SPARC:#define __sparcv8 1