libast/features/sfio: remove unused feature tests

The results of these feature tests are not used anywhere. Research
in the open-ast-archive repo shows that some of them (like vax_asm)
became unused between 1995 and 1998.

src/lib/libast/features/sfio

@@ -1,7 +1,4 @@
 ref	-D_def_map_ast=1
-hdr	float,floatingpoint,math,values
-sys	filio,ioctl
-lib	qfrexp,qldexp
 key	signed
 
 tst	- note{ number of bits in pointer }end output{
@@ -87,83 +84,3 @@ more long_int note{ long is larger than int }end execute{
 		return sizeof(long) > sizeof(int) ? 0 : 1;
 	}
 }end
-
-tst	vax_asm note{ layout ok for vax string operations }end execute{
-	int
-	main(void)
-	{
-	#ifndef vax
-		return absurd = -1;
-	#else
-		int	r11, r10, r9, r8, r7, r6;
-		r11 = r10 = r9 = r8 = r7 = r6 = -1;
-		asm("clrw	r11");
-		asm("clrw	r10");
-		asm("clrw	r9");
-		asm("clrw	r8");
-		asm("clrw	r7");
-		asm("clrw	r6");
-		if(sizeof(int) != sizeof(char*) || r11 || r10 || r9 || r8 || r7 || r6 )
-			return -1;
-		return 0;
-	#endif
-	}
-}end
-
-tst	lib_cvt note{ native floating point conversions ok }end link{
-	extern char* ecvt(double, int, int*, int*);
-	extern char* fcvt(double, int, int*, int*);
-	extern double strtod(const char*, char**);
-	int
-	main(void)
-	{
-		ecvt(0.0, 0, 0, 0);
-		fcvt(0.0, 0, 0, 0);
-		strtod(0, 0);
-		return 0;
-	}
-}end
-
-tst	xopen_stdio note{ Stdio fseek/fflush are X/Open-compliant }end execute{
-	#include <fcntl.h>
-	#include <unistd.h>
-	#define Failed(file)	(unlink(file),1)
-	int
-	main(int argc, char **argv)
-	{	FILE	*f1, *f2;
-		char	file[1024], buf[1024], *f, *t;
-		int	i, fd;
-
-		/* create file */
-		for(f = argv[0], t = file; (*t = *f++) != 0; )
-			t++;
-		*t++ = '.'; *t++ = 'D'; *t++ = 0;
-		if((fd = creat(file,0666)) < 0)
-			return 1;
-
-		for (i = 0; i < sizeof(buf); ++i)
-			buf[i] = '0' + (i%10);
-		for (i = 0; i < 16; ++i)
-			if (write(fd,buf,sizeof(buf)) != sizeof(buf))
-				return Failed(file);
-		close(fd);
-
-		if(!(f1 = fopen(file,"r+")) ||
-		   (fd = dup(fileno(f1))) < 0 ||
-		   !(f2 = fdopen(fd,"r+")) )
-			return Failed(file);
-
-		if(fread(buf, 1, 7, f2) != 7 || ftell(f2) != 7)
-			return Failed(file);
-
-		if(fseek(f1, 1010, 0) < 0 || ftell(f1) != 1010)
-			return Failed(file);
-
-		fflush(f2); /* this should set the seek location to 1010 */
-		if(ftell(f2) != 1010)
-			return Failed(file);
-
-		unlink(file);
-		return 0;
-	}
-}end