Use FUSE_CFLAGS and FUSE_LIBS from pkg-config

Include <fuse_lowlevel.h>, not <fuse/fuse_lowlevel.h>, the include path
should be set up for that.

Don't define _FILE_OFFSET_BITS in one file, FUSE_CFLAGS would enable it
for the whole xrdp-chansrv build if needed.

sesman/chansrv/Makefile.am

@@ -8,8 +8,8 @@ AM_CPPFLAGS = \
 CHANSRV_EXTRA_LIBS =
 
 if XRDP_FUSE
-AM_CPPFLAGS += -DXRDP_FUSE
-CHANSRV_EXTRA_LIBS += -lfuse
+AM_CPPFLAGS += -DXRDP_FUSE $(FUSE_CFLAGS)
+CHANSRV_EXTRA_LIBS += $(FUSE_LIBS)
 endif
 
 if XRDP_OPUS

sesman/chansrv/chansrv_fuse.c

@@ -87,9 +87,8 @@ void xfuse_devredir_cb_file_close(void *vp)                                  {}
 ******************************************************************************/
 
 #define FUSE_USE_VERSION 26
-#define _FILE_OFFSET_BITS 64
 
-#include <fuse/fuse_lowlevel.h>
+#include <fuse_lowlevel.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>