musl doesn't support //ignore:

 mandb: iconv_open ("UTF-8//IGNORE", "ISO-8859-1"): Invalid argument

so just remove it
--
diff --git a/src/convert.c b/src/convert.c
index 447240c..4f4d006 100644
--- a/src/convert.c
+++ b/src/convert.c
@@ -56,7 +56,7 @@ char * ATTRIBUTE_MALLOC convert_to_locale (char *string)
 {
 	if (!conv_to_locale_initialized) {
 		char *locale_charset = xasprintf
-			("%s//IGNORE", get_locale_charset ());
+			("%s", get_locale_charset ());
 		conv_to_locale = iconv_open (locale_charset, "UTF-8");
 		free (locale_charset);
 		if (conv_to_locale != (iconv_t) -1)
diff --git a/src/manconv.c b/src/manconv.c
index e775b1b..41a11bd 100644
--- a/src/manconv.c
+++ b/src/manconv.c
@@ -301,7 +301,7 @@ static tried_iconv try_iconv (decompress *decomp, const char *try_from_code,
 	iconv_t cd_utf8, cd = NULL;
 	bool to_utf8 = STREQ (try_to_code, "UTF-8") ||
 		       STRNEQ (try_to_code, "UTF-8//", 7);
-	const char *utf8_target = last ? "UTF-8//IGNORE" : "UTF-8";
+	const char *utf8_target = "UTF-8";
 	bool ignore_errors = (strstr (try_to_code, "//IGNORE") != NULL);
 	tried_iconv ret = TRIED_ICONV_OK;