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hyph: load english hyphenation patterns with ".hpf"

When the .hpf and .hpfa requests have no arguments, neatroff
loads the built-in English hyphenation patterns and exceptions.

--- a/hyph.c

+++ b/hyph.c

@@ -240,9 +240,14 @@

 {

 	char tok[ILNLEN];

 	FILE *filp;

+	hyinit = 1;

+	/* load english hyphenation patterns with no arguments */

+	if (!args[1]) {

+		hyph_readpatterns(en_patterns);

+		hyph_readexceptions(en_exceptions);

+	}

 	/* reading patterns */

 	if (args[1]) {

-		hyinit = 1;

 		filp = fopen(args[1], "r");

 		while (fscanf(filp, "%s", tok) == 1)

 			if (strlen(tok) < WORDLEN)