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ape/lib9: expose fd2path (thanks phil9)

Fd2path is a useful call for the netsurf plan9 frontend,
so we should expose it.

--- a/sys/include/ape/lib9.h

+++ b/sys/include/ape/lib9.h

@@ -74,5 +74,6 @@

 extern	unsigned long	getfsr(void);

 extern	void		setfcr(unsigned long);

 extern	void		setfsr(unsigned long);

+extern	int 	fd2path(int, char*, int);

 #endif

--- /dev/null

+++ b/sys/src/ape/lib/9/fd2path.c

@@ -1,0 +1,9 @@

+#include <lib9.h>

+

+extern	int	_FD2PATH(int, char*, int);

+

+int

+fd2path(int fd, char *buf, int nbuf)

+{

+	return _FD2PATH(fd, buf, nbuf);

+}

--- a/sys/src/ape/lib/9/mkfile

+++ b/sys/src/ape/lib/9/mkfile

@@ -28,6 +28,7 @@

 	u32.$O\

 	u64.$O\

 	unmount.$O\

+	fd2path.$O\

 </sys/src/cmd/mksyslib