disable floating point support in *printf and *scanf

This would require pulling in libm, for which we aren't ready yet.

libc/build.mak

 libc :=
 
-libc += internal/floatscan.o
+#libc += internal/floatscan.o
 libc += internal/intscan.o
 libc += internal/libc.o
 libc += internal/__lock.o

libc/stdio/vfprintf.c

@@ -200,6 +200,7 @@ static char *fmt_u(uintmax_t x, char *s)
 	return s;
 }
 
+#ifdef HAVE_FLOAT_SUPPORT
 static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
 {
 	uint32_t big[(LDBL_MAX_EXP+LDBL_MANT_DIG)/9+1];
@@ -430,6 +431,7 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
 
 	return MAX(w, pl+l);
 }
+#endif /* HAVE_FLOAT_SUPPORT */
 
 static int getint(char **s) {
 	int i;
@@ -618,10 +620,12 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
 			pad(f, ' ', w, p, fl^LEFT_ADJ);
 			l = w>p ? w : p;
 			continue;
+#ifdef HAVE_FLOAT_SUPPORT
 		case 'e': case 'f': case 'g': case 'a':
 		case 'E': case 'F': case 'G': case 'A':
 			l = fmt_fp(f, arg.f, w, p, fl, t);
 			continue;
+#endif
 		}
 
 		if (p < z-a) p = z-a;

libc/stdio/vfscanf.c

@@ -85,7 +85,9 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 	int invert;
 	int matches=0;
 	unsigned long long x;
+#ifdef HAVE_FLOAT_SUPPORT
 	long double y;
+#endif
 	off_t pos = 0;
 
 	FLOCK(f);
@@ -284,6 +286,7 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 			if (t=='p' && dest) *(void **)dest = (void *)(uintptr_t)x;
 			else store_int(dest, size, x);
 			break;
+#ifdef HAVE_FLOAT_SUPPORT
 		case 'a': case 'A':
 		case 'e': case 'E':
 		case 'f': case 'F':
@@ -302,6 +305,7 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 				break;
 			}
 			break;
+#endif
 		case 'S':
 			wcs = dest;
 			st = (mbstate_t){ 0 };