headers: allow DeleteVolumeMountPointA in winstore builds

https://docs.microsoft.com/en-us/uwp/win32-and-com/win32-apis#apis-from-api-ms-win-core-file-ansi-l1-1-0dll

It's not in fileapi.h, unlike DeleteVolumeMountPointW

Signed-off-by: Liu Hao <lh_mouse@126.com>
diff --git a/mingw-w64-headers/include/winbase.h b/mingw-w64-headers/include/winbase.h
index 6cddb77..0dfb261 100644
--- a/mingw-w64-headers/include/winbase.h
+++ b/mingw-w64-headers/include/winbase.h
@@ -2608,7 +2608,6 @@
   WINBASEAPI WINBOOL WINAPI FindVolumeMountPointClose (HANDLE hFindVolumeMountPoint);
   WINBASEAPI WINBOOL WINAPI SetVolumeMountPointA (LPCSTR lpszVolumeMountPoint, LPCSTR lpszVolumeName);
   WINBASEAPI WINBOOL WINAPI SetVolumeMountPointW (LPCWSTR lpszVolumeMountPoint, LPCWSTR lpszVolumeName);
-  WINBASEAPI WINBOOL WINAPI DeleteVolumeMountPointA (LPCSTR lpszVolumeMountPoint);
   WINBASEAPI WINBOOL WINAPI GetVolumeNameForVolumeMountPointA (LPCSTR lpszVolumeMountPoint, LPSTR lpszVolumeName, DWORD cchBufferLength);
   WINBASEAPI WINBOOL WINAPI GetVolumePathNameA (LPCSTR lpszFileName, LPSTR lpszVolumePathName, DWORD cchBufferLength);
   WINBASEAPI WINBOOL WINAPI GetVolumePathNamesForVolumeNameA (LPCSTR lpszVolumeName, LPCH lpszVolumePathNames, DWORD cchBufferLength, PDWORD lpcchReturnLength);
@@ -2619,7 +2618,6 @@
 #ifndef UNICODE
 #define FindFirstVolume FindFirstVolumeA
 #define FindNextVolume FindNextVolumeA
-#define DeleteVolumeMountPoint DeleteVolumeMountPointA
 #define GetVolumeNameForVolumeMountPoint GetVolumeNameForVolumeMountPointA
 #define GetVolumePathName GetVolumePathNameA
 #define GetVolumePathNamesForVolumeName GetVolumePathNamesForVolumeNameA
@@ -2798,6 +2796,14 @@
 #endif
 #endif
 
+#if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_APP)
+  WINBASEAPI WINBOOL WINAPI DeleteVolumeMountPointA (LPCSTR lpszVolumeMountPoint);
+#ifndef UNICODE
+#define DeleteVolumeMountPoint DeleteVolumeMountPointA
+#endif
+#endif /* WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_APP) */
+
+
 #if _WIN32_WINNT >= 0x0600
 #if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_APP)
   typedef struct _FILE_BASIC_INFO {