qrexec-utils: disable write-stdin (buffered writes) compilation

Not compatible with new qrexec protocol yet. To be done.

qrexec-lib/Makefile

@@ -11,7 +11,7 @@ endif
 
 
 all: libqrexec-utils.so.$(SO_VER) libqubes-rpc-filecopy.so.$(SO_VER)
-libqrexec-utils.so.$(SO_VER): unix-server.o ioall.o buffer.o write-stdin.o exec.o txrx-vchan.o
+libqrexec-utils.so.$(SO_VER): unix-server.o ioall.o buffer.o exec.o txrx-vchan.o
 	$(CC) $(LDFLAGS) -Wl,-soname,$@ -o $@ $^ $(XENLIBS)
 libqubes-rpc-filecopy.so.$(SO_VER): ioall.o copy-file.o crc32.o unpack.o
 	$(CC) $(LDFLAGS) -Wl,-soname,$@ -o $@ $^

qrexec-lib/libqrexec-utils.h

@@ -51,14 +51,4 @@ void set_block(int fd);
 int get_server_socket(const char *);
 int do_accept(int s);
 
-enum {
-	WRITE_STDIN_OK = 0x200,
-	WRITE_STDIN_BUFFERED,
-	WRITE_STDIN_ERROR
-};
-
-int flush_client_data(libvchan_t *vchan, int fd, int client_id, struct buffer *buffer);
-int write_stdin(libvchan_t *vchan, int fd, int client_id, const char *data, int len,
-		struct buffer *buffer);
 void set_nonblock(int fd);
-int fork_and_flush_stdin(int fd, struct buffer *buffer);