[Clang][Cygwin] Remove erroneous define

Co-authored-by: Jeremy Drake <[email protected]>

Author: mati865

clang/tools/libclang/CIndexer.cpp

@@ -29,7 +29,6 @@
 #ifdef __CYGWIN__
 #include <cygwin/version.h>
 #include <sys/cygwin.h>
-#define _WIN32 1
 #endif
 
 #ifdef _WIN32
@@ -112,16 +111,6 @@ const std::string &CIndexer::getClangResourcesPath() {
                sizeof(mbi));
   GetModuleFileNameA((HINSTANCE)mbi.AllocationBase, path, MAX_PATH);
 
-#ifdef __CYGWIN__
-  char w32path[MAX_PATH];
-  strcpy(w32path, path);
-#if CYGWIN_VERSION_API_MAJOR > 0 || CYGWIN_VERSION_API_MINOR >= 181
-  cygwin_conv_path(CCP_WIN_A_TO_POSIX, w32path, path, MAX_PATH);
-#else
-  cygwin_conv_to_full_posix_path(w32path, path);
-#endif
-#endif
-
   LibClangPath += path;
 #elif defined(_AIX)
   getClangResourcesPathImplAIX(LibClangPath);