Detect SvStream::operator<< calls with bool args w/o using -Wsign-promo
Detect SvStream::operator<< calls with bool args w/o using -Wsign-promo

...as -Wsign-promo caused other problems and has been removed again with
488823a140217e393298bc83e75084041a85ed45 "Remove -Wsign-promo."  It had
originally been introduced with e8bbb76827dd7a0e30d7d1db34a812a84d85f390 "ensure
correct export size type in stream operation," apparently to detect an
SvStream::operator<< call with a bool argument that would pick the "int"
overload instead of the "unsigned char" (aka sal_Bool) one (which would have
happened to trigger the -Wsign-promo warning "by luck," given that sal_Bool is
unsigned char and not signed char, say).

Change-Id: I0bf4389753e53a535bd90ca2a98b6a5be63d179a
Reviewed-on: https://gerrit.libreoffice.org/1798
Reviewed-by: Luboš Luňák <b5c5550b076ca5e3b0f00f104f523b73456d8824@suse.cz>
Tested-by: Luboš Luňák <b5c5550b076ca5e3b0f00f104f523b73456d8824@suse.cz>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core