Fix PGShmemType and HugePagesType typedefs

The automatic process for collecting typedefs in the buildfarm only picks up
typedef names that are used to declare objects (variables, struct fields,
function parameters or results). The typedef names mentioned in the subject are
not referenced at all, anywhere. Hence they are not picked up by the buildfarm
process causing their declarations to be wrongly indented. This commit changes
them to plain enums thus avoiding the wrong indentation.

Author: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Fix suggested by: Tom Lane <tgl@sss.pgh.pa.us>

Author: ashutosh-bapat

src/include/storage/pg_shmem.h

@@ -48,21 +48,21 @@ extern PGDLLIMPORT int huge_page_size;
 extern PGDLLIMPORT int huge_pages_status;
 
 /* Possible values for huge_pages and huge_pages_status */
-typedef enum
+enum HugePagesType
 {
 	HUGE_PAGES_OFF,
 	HUGE_PAGES_ON,
 	HUGE_PAGES_TRY,				/* only for huge_pages */
 	HUGE_PAGES_UNKNOWN,			/* only for huge_pages_status */
-}			HugePagesType;
+};
 
 /* Possible values for shared_memory_type */
-typedef enum
+enum PGShmemType
 {
 	SHMEM_TYPE_WINDOWS,
 	SHMEM_TYPE_SYSV,
 	SHMEM_TYPE_MMAP,
-}			PGShmemType;
+};
 
 #ifndef WIN32
 extern PGDLLIMPORT unsigned long UsedShmemSegID;