test/demogrx.c: Now that GrLoadFont() can safely be used before GrSetMode(), load lucb21.fnt and lucb40b.fnt before switching to graphics mode. This eliminates the need to switch back to text mode when aborting because of a missing font, i.e. disaster().
linetest.c: don't #include <pc.h> if __DJGPP__, that's pointless speedtst.c: use fgets() instead of getch() when in text mode
test.c: don't declare the old style keyboard I/O getch() and kbhit() functions - someone with watcom C, please verify if this was the only reason for including <conio.h> in __WATCOMC__; use fgets() instead of getch() when in text mode, as in speedtst.c
textpatt.c: Simplified p1/p2/font conditions - we're not using ADA, so if(pointer) and if(!pointer) should be valid tests even if the pointer has been free()-d; also, no ordinary GRX function can (or should be able to) set it's pointer argument to NULL.