lang/seed7: update to 05_20160330

Changes:

• The makefile mk_clangw.mak has been added. This makefile supports compilation under Windows with the clang compiler.
• The experimental function parentDir has been added to osfiles.s7i.
• The experimental function getServerCertificate has been added to tls.s7i.
• The compiler (s7c) has been improved to use the function strAppendN, when two or more strings are appended to a string.
• Tests for string append (operator &:= ) have been added to chkstr.sd7.
• The function strAppendN has been added to str_rtl.c.
• The function strCopy in str_rtl.c has been simplified.
• The program chkccomp.c has been improved to write a definition of CHAR_BIT, when it is not defined in limits.h.
• Several files have been changed to use CHAR_BIT instead of the literal 8.
• in chkccomp.c several string literals have been changed to wide string literals (e.g. L"abc" instead of "abc").
• In several files integer literals have been replaced by contants or #define macros.
• The function mulodi4 has been added to int_rtl.c. This function is used by clang under Windows, but unfortunately is not part of the runtime library. This situation is recognized by chkccomp.c and the function mulodi4 in int_rtl.c is used instead.