Turn off LF/CRLF conversion in FatFS string functions

[breakintoprogram]

Raised by envenomator on Twitter:

If an 0x0D (\r) is written to a file, the byte 0x0A (\n) is also written.

[breakintoprogram]

The only conversion I can see is here.
Line 6500 of ff.c

if (FF_USE_STRFUNC == 2 && c == '\n') {	 /* LF -> CRLF conversion */
	putc_bfd(pb, '\r');
}

Setting FF_USE_STRFUNC to 1 in ffconf.h will turn off LF -> CRLF conversion

[envenomator]

I always forget which one is which (CR/LF). Just tested with a small piece of code, writing to a file with fa_write | fa_create_always. As soon as I write a 0x0a, the 0x0D is immediately added as well. When I write a 0x0D, just 0x0D gets written, nothing extra.

[envenomator]

Defined FF_USE_STRFUNC as 1 in ffconf.h and reflashed MOS 1.02; no additional 0x0Ds are added anymore, which is good. Also checked if saves/loads in BBCBASIC still work, which they do. So I think indeed setting this solves the issue; great!