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archacpi: leave acpi enabled with *acpi=

*acpi= was treated the same as *acpi=0, when we
want it to be treated the same as *acpi=1

--- a/sys/src/9/pc/archacpi.c

+++ b/sys/src/9/pc/archacpi.c

@@ -791,7 +791,7 @@

 	char *cp;

 	Tbl *t;

-	if((cp = getconf("*acpi")) == nil)

+	if((cp = getconf("*acpi")) == nil || *cp == '\0')

 		cp = "1";	/* search for rsd by default */

 	v = (uintptr)strtoull(cp, nil, 16);

 	if(v <= 1)