Fix Waf compilation (path to modbus.h)

modbus/Makefile.am

@@ -6,5 +6,4 @@ libmodbus_la_LDFLAGS = -version-info 2:0:0
 libmodbusincludedir = $(includedir)/modbus
 libmodbusinclude_HEADERS = modbus.h
 
-INCLUDES = -I$(top_srcdir)
 CLEANFILES = *~

modbus/modbus.c

@@ -46,7 +46,7 @@
 #include <netinet/ip.h>
 #include <netinet/tcp.h>
 
-#include <modbus/modbus.h>
+#include "modbus.h"
 
 #define UNKNOWN_ERROR_MSG "Not defined in modbus specification"
 

tests/wscript

@@ -1,14 +1,14 @@
 def build(bld):
     obj = bld.create_obj('cc', 'program')
     obj.source = 'test-modbus-master.c'
-    obj.includes = '.'
+    obj.includes = '. ..'
     obj.uselib_local = 'modbus'
     obj.target = 'test-modbus-master'
     obj.inst_var = 0
 
     obj = bld.create_obj('cc', 'program')
     obj.source = 'test-modbus-slave.c'
-    obj.includes = '.'
+    obj.includes = '. ..'
     obj.uselib_local = 'modbus'
     obj.target = 'test-modbus-slave'
     obj.inst_var = 0