Merge branch 'feature/andre/libc-wcscasecmp' into 'master'

share/libc/wchar.c

share/libc/wchar.h

src/plugins/variadic/tests/known/oracle/printf.res.oracle

src/plugins/variadic/tests/known/oracle/swprintf.res.oracle

src/plugins/variadic/tests/known/oracle/wchar.res.oracle

tests/libc/oracle/fc_libc.0.res.oracle

tests/libc/oracle/fc_libc.1.res.oracle

tests/libc/oracle/wchar_c_h.0.res.oracle

tests/libc/oracle/wchar_h.res.oracle

tests/libc/wchar_c_h.c

tests/libc/wchar_h.c