FIPS: Do not build md5-non-fips.o unless really needed

This is not needed anymore when using OpenSSL keying exporter
functionality for PRF.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/Makefile

@@ -1107,8 +1107,10 @@ ifdef CONFIG_INTERNAL_MD5
 MD5OBJS += ../src/crypto/md5-internal.o
 endif
 ifdef CONFIG_FIPS
+ifdef NEED_TLS_PRF
 MD5OBJS += ../src/crypto/md5-non-fips.o
 endif
+endif
 OBJS += $(MD5OBJS)
 OBJS_p += $(MD5OBJS)
 endif