lang/seed7: update to 05_20180821

20180821:
- In fil_dos.c in the function setupFiles the handling of ctrl-c has
  been improved such that ctrl-c is sent immediate (without the need to
  press return afterwards). Additionally redirected stdin, stdout and
  stderr files are switched to binary mode now.
- In the compiler (in comp/const.s7i) the actions BIN_XOR, ENU_ICONV2,
  ENU_ORD2, INT_ICONV1 and INT_ICONV3 have been added to the list of
  special actions.
- The batch files bin/call_gcc.bat and bin/call_ar.bat have been
  improved to set environment variables with the command 'set'. This
  is necessary to execute them successfully under Wine.
- The description of log, log10 and log2 in the manual has been
  improved.
- In flt_rtl.c the functions fltLog, fltLog10 and fltLog2 have been
  added. This functions are based on the original functions log(),
  log10() and log2() and work according to IEEE 754.
- The configuration values LOG_FUNCTION_OKAY, LOG10_FUNCTION_OKAY and
  LOG2_FUNCTION_OKAY have been added to cc_conf.s7i.
- The configuration value HAS_LOG2 has been removed from cc_conf.s7i.
- The compiler (s7c) has been improved to use the functions fltLog,
  fltLog10 and fltLog2.
- In comp/inline.s7i the functions push_inline_func_param,
  pop_inline_func_param, push_inline_proc_param and
  pop_inline_proc_param have been improved to support inline functions
  with 'attr' parameters.
- The example program diff7.sd7 has been improved.
- Documentation comments have been improved in math.s7i and tar.s7i.
- In chkflt.sd7 the tests for the operators 'parse' and 'sci' and for
  the function str() have been improved.
- The program chkccomp.c has been improved to define the macros
  POW_OF_NEGATIVE_OKAY, LOG_OF_NAN_OKAY, LOG_OF_ZERO_OKAY,
  LOG_OF_NEGATIVE_OKAY, LOG10_OF_NAN_OKAY, LOG10_OF_ZERO_OKAY,
  LOG10_OF_NEGATIVE_OKAY, LOG2_OF_NAN_OKAY, LOG2_OF_ZERO_OKAY,
  LOG2_OF_NEGATIVE_OKAY, MEMCMP_RETURNS_SIGNUM and
  WMEMCMP_RETURNS_SIGNUM.
- In chkccomp.c the function determineFseekFunctions has been improved
  to make tests that actually use fseek() and ftell().
- Calls of logFunction have been added in cmd_rtl.c, str_rtl.c,
  strlib.c and striutl.c.
- In bstlib.c the function bst_cmp() has been improved to be based on
  bstCmp().
- The functions strCompare(), str_cmp() and bstCmp() have been
  improved to use different code depending on MEMCMP_RETURNS_SIGNUM
  and WMEMCMP_RETURNS_SIGNUM.
- In s7c.sd7 the function canTakeAddress has been improved to return
  FALSE for a CONSTENUMOBJECT.

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