sqlite: Use 0600

The in-tree SQLite3 is used for HDB and ccache -- these should have
0600 permissions.

Of course, if we're using an out-of-tree SQLite3, then we need to rely
on the process' umask, but we use SQLite3 in libraries, where we can't
set the umask...

What to do?

TBD:

 - On Windows: nothing to do.

 - On Unix: if SQLite3 is out of tree then [v]fork() to create the
   connection then close, then connect again after??

   Or... maybe make sure to create an intermediate directory with 0700
   permissions?

lib/sqlite/Makefile.am

@@ -3,7 +3,7 @@
 include $(top_srcdir)/Makefile.am.common
 
 if ENABLE_PTHREAD_SUPPORT
-AM_CPPFLAGS += -DSQLITE_THREADSAFE=1
+AM_CPPFLAGS += -DSQLITE_THREADSAFE=1 -DSQLITE_DEFAULT_FILE_PERMISSIONS=0600
 endif
 
 AM_CPPFLAGS += -DSQLITE_WITHOUT_ZONEMALLOC=1

lib/sqlite/NTMakefile

@@ -37,6 +37,10 @@ INCFILES=	\
 	$(INCDIR)\sqlite3.h	\
 	$(INCDIR)\sqlite3ext.h
 
+# pmode 0600 = _S_IREAD | _S_IWRITE
+cdefines = $(cdefines) \
+	-DSQLITE_DEFAULT_FILE_PERMISSIONS=0600
+
 $(LIBSQLITE): $(OBJ)\sqlite3.obj
 	$(LIBCON)