Update unit-test.h.in

[chowchin]

fixing "initializer element is not constant" error

[cla-bot]

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[stephane]

It seems a wrong error (const + const = const) from your compiler. How did your trigger the issue?

[mutoukenji]

I've the same error when I cross compile with arm-linux-gnueabihf-gcc-4.9.4, any solution about it?

make --no-print-directory all-recursive
Making all in src
  CC       modbus.lo
  CC       modbus-data.lo
  CC       modbus-rtu.lo
  CC       modbus-tcp.lo
  CCLD     libmodbus.la
Making all in tests
make  all-am
  CC       bandwidth-server-one.o
  CCLD     bandwidth-server-one
  CC       bandwidth-server-many-up.o
  CCLD     bandwidth-server-many-up
  CC       bandwidth-client.o
  CCLD     bandwidth-client
  CC       random-test-server.o
  CCLD     random-test-server
  CC       random-test-client.o
  CCLD     random-test-client
  CC       unit-test-server.o
In file included from unit-test-server.c:27:0:
unit-test.h:34:1: error: initializer element is not constant
 const uint16_t UT_BITS_ADDRESS_INVALID_REQUEST_LENGTH = UT_BITS_ADDRESS + 2;
 ^
make[3]: *** [Makefile:700: unit-test-server.o] Error 1
make[2]: *** [Makefile:597: all] Error 2
make[1]: *** [Makefile:505: all-recursive] Error 1
make: *** [Makefile:391: all] Error 2