Add comment about \# in bcc makefiles.

src/bin/psql/bcc32.mak

@@ -148,6 +148,7 @@ LINK32_OBJS	= $(LINK32_OBJS) "..\..\interfaces\libpq\Debug\blibpqddll.lib"
 LINK32_OBJS	= $(LINK32_OBJS) "..\..\interfaces\libpq\Release\blibpqdll.lib"
 !ENDIF
 
+# Have to use \# so # isn't treated as a comment, but MSVC doesn't like this
 "..\..\port\pg_config_paths.h": win32.mak
 	echo \#define PGBINDIR "" >$@
 	echo \#define PGSHAREDIR "" >>$@

src/interfaces/libpq/bcc32.mak

@@ -142,6 +142,7 @@ config: ..\..\include\pg_config.h pthread.h pg_config_paths.h
 pthread.h: pthread.h.win32
 	copy pthread.h.win32 pthread.h
 
+# Have to use \# so # isn't treated as a comment, but MSVC doesn't like this
 pg_config_paths.h: bcc32.mak
 	echo \#define SYSCONFDIR "" > pg_config_paths.h