Old code now throwing up build error, and more clang format frigging

[jajhall]

Fixes

home/runner/work/HiGHS/HiGHS/src/lp_data/HighsIis.cpp:43:70: warning: format specifies type 'int' but the argument has type 'HighsInt' (aka 'long') [-Wformat]
for (HighsInt iCol = 0; iCol < num_iis_col; iCol++) printf("%9d ", iCol);