[PATCH] Fix cache dir resolving on Windows

[orgads@gmail.com]

From: Orgad Shaneh <orgads@gmail.com>

... when not running from MSYS environment, and HOME is not set.
---
 gdb/common/pathstuff.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdb/common/pathstuff.c b/gdb/common/pathstuff.c
index 2b1669a5b9..59410fb61f 100644
--- a/gdb/common/pathstuff.c
+++ b/gdb/common/pathstuff.c
@@ -231,6 +231,10 @@ get_standard_cache_dir ()
 #endif
 
   const char *home = getenv ("HOME");
+#ifdef _WIN32
+  if (home == nullptr)
+      home = getenv ("APPDATA");
+#endif
   if (home != NULL)
     {
       /* Make sure the path is absolute and tilde-expanded.  */
-- 
2.20.1