Fix assorted compiler warnings seen in the buildfarm.

Failure to use DatumGetFoo/FooGetDatum macros correctly, or at all,
causes some warnings about sign conversion.  This is just cosmetic
at the moment but in principle it's a type violation, so clean up
the instances I could find.

autoprewarm.c and sharedfileset.c contained code that unportably
assumed that pid_t is the same size as int.  We've variously dealt
with this by casting pid_t to int or to unsigned long for printing
purposes; I went with the latter.

Fix uninitialized-variable warning in RestoreGUCState.  This is
a live bug in some sense, but of no great significance given that
nobody is very likely to care what "line number" is associated with
a GUC that hasn't got a source file recorded.

src/backend/storage/file/sharedfileset.c

@@ -214,9 +214,9 @@ SharedFileSetPath(char *path, SharedFileSet *fileset, Oid tablespace)
 	char		tempdirpath[MAXPGPATH];
 
 	TempTablespacePath(tempdirpath, tablespace);
-	snprintf(path, MAXPGPATH, "%s/%s%d.%u.sharedfileset",
+	snprintf(path, MAXPGPATH, "%s/%s%lu.%u.sharedfileset",
 			 tempdirpath, PG_TEMP_FILE_PREFIX,
-			 fileset->creator_pid, fileset->number);
+			 (unsigned long) fileset->creator_pid, fileset->number);
 }
 
 /*