a few tweaks for bionic

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/inet_common.c b/libbb/inet_common.c
index 207720e..7208db9 100644
--- a/libbb/inet_common.c
+++ b/libbb/inet_common.c
@@ -175,7 +175,8 @@
 		return -1;
 	}
 	memcpy(sin6, ai->ai_addr, sizeof(*sin6));
-	freeaddrinfo(ai);
+	if (ai)
+		freeaddrinfo(ai);
 	return 0;
 }
 
diff --git a/libbb/obscure.c b/libbb/obscure.c
index dd8cd31..9ecc1f6 100644
--- a/libbb/obscure.c
+++ b/libbb/obscure.c
@@ -109,10 +109,12 @@
 	if (string_checker(new_p, pw->pw_name)) {
 		return "similar to username";
 	}
+#ifndef __BIONIC__
 	/* no gecos as-is, as sub-string, reversed, capitalized, doubled */
 	if (pw->pw_gecos[0] && string_checker(new_p, pw->pw_gecos)) {
 		return "similar to gecos";
 	}
+#endif
 	/* hostname as-is, as sub-string, reversed, capitalized, doubled */
 	hostname = safe_gethostname();
 	i = string_checker(new_p, hostname);
diff --git a/miscutils/adjtimex.c b/miscutils/adjtimex.c
index 98b6ccf..c8816e9 100644
--- a/miscutils/adjtimex.c
+++ b/miscutils/adjtimex.c
@@ -23,7 +23,11 @@
 //usage:     "\n	-p TCONST"
 
 #include "libbb.h"
-#include <sys/timex.h>
+#ifdef __BIONIC__
+# include <linux/timex.h>
+#else
+# include <sys/timex.h>
+#endif
 
 static const uint16_t statlist_bit[] = {
 	STA_PLL,
diff --git a/miscutils/setserial.c b/miscutils/setserial.c
index 26902a2..2a034e3 100644
--- a/miscutils/setserial.c
+++ b/miscutils/setserial.c
@@ -11,7 +11,7 @@
 //config:config SETSERIAL
 //config:	bool "setserial"
 //config:	default y
-//config:	depends on PLATFORM_LINUX
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	  Retrieve or set Linux serial port.