Rule 20.9 : Deprecated use of <stdio.>

These are typically seen when EWL defines functions from this header.

./src/assert.c
./src/math_float.c
./src/string.c
./src/strtol.c
./src/wchar_io.c
./src/wcstoul.c
./src/wctype.c
./src/wprintf.c
./src/wprintformat.c
./src/wscanf.c
./src/wstring.c