#1102 PIC14: nonexisting struct initialization

[Philipp Klaus Krause]

const struct test x = {0};

will compile giving only some misleading warnings, no
errors.

I compile using
sdcc -mpic14 -p16c745 -c --std-c99

sdcc --version
gives
SDCC :
mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
2.5.6 #1246 (Apr 12 2006) (UNIX)

[Maarten Brock]

This should now be fixed for all but pic14 targets.

[Christopher Bazley]

Original PIC14 incomplete-structure initialiser now gets error 66, rather than only misleading warnings.

https://godbolt.org/z/KTxMfbzj5

[Christopher Bazley]

Added regression test in [r17046]