Add support for stripping non-native object files by using an

environment variable that specifies the name of the strip(1)
program to use. The envvar is "STRIPBIN". The more natural
choice would be "STRIP", but that one is taken already.

usr.bin/xinstall/xinstall.c

@@ -701,6 +701,7 @@ void
 strip(to_name)
 	const char *to_name;
 {
+	const char *stripbin;
 	int serrno, status;
 
 	switch (fork()) {
@@ -710,7 +711,10 @@ strip(to_name)
 		errno = serrno;
 		err(EX_TEMPFAIL, "fork");
 	case 0:
-		execlp("strip", "strip", to_name, (char *)NULL);
+		stripbin = getenv("STRIPBIN");
+		if (stripbin == NULL)
+			stripbin = "strip";
+		execlp(stripbin, stripbin, to_name, (char *)NULL);
 		err(EX_OSERR, "exec(strip)");
 	default:
 		if (wait(&status) == -1 || status) {