Check for sys/sem.h and disable snapscan if it isn't available.

Removed "//" (C++-style comment) from config.h.in.
Henning Meier-Geinitz <henning@meier-geinitz.de>

backend/Makefile.in

@@ -55,7 +55,7 @@ COMPILE = $(CC) -c $(CFLAGS) $(DEFS) $(INCLUDES) $(CPPFLAGS)
 PRELOADABLE_BACKENDS = abaton agfafocus apple artec as6e avision bh canon \
         coolscan dc25 @DC210@ @DC240@ dmc epson hp m3096g microtek microtek2 \
 	mustek mustek_pp nec @NET@ pie @PINT@ plustek @PNM@ @QCAM@ ricoh \
-	s9036 sharp @SM3600@ snapscan sp15c st400 tamarack umax umax_pp @V4L@
+	s9036 sharp @SM3600@ @SNAPSCAN@ sp15c st400 tamarack umax umax_pp @V4L@
 ALL_BACKENDS = $(PRELOADABLE_BACKENDS) dll
 
 LIBS = $(addprefix libsane-,$(addsuffix .la,$(ALL_BACKENDS)))

include/sane/config.h.in

@@ -51,7 +51,7 @@
 
 #ifdef NEED_SYS_BITYPES_H
 # include <sys/bitypes.h>
-#else // not NEED_SYS_BITYPES_H
+#else /* not NEED_SYS_BITYPES_H */
 
 /* Define to `unsigned char' if <sys/types.h> doesn't define.  */
 #undef u_char
@@ -71,7 +71,7 @@
 /* Define to `unsigned int' if <sys/types.h> doesn't define. */
 #undef u_int32_t
 
-#endif // not NEED_SYS_BITYPES_H
+#endif /* not NEED_SYS_BITYPES_H */
 
 /* Define to `long' if <sys/types.h> doesn't define.  */
 #undef ssize_t
@@ -347,6 +347,9 @@
 /* Define if you have sys/bitypes.h. */
 #undef HAVE_SYS_BITYPES_H
 
+/* Define if you have sys/sem.h. */
+#undef HAVE_SYS_SEM_H
+
 /* Define if you have the <unistd.h> header file.  */
 #undef HAVE_UNISTD_H