rtcmix: fix test operator

Add more stuff to TODO (doesn't build on amd64).

rtcmix/TODO

@@ -3,3 +3,6 @@ Talk with the developers to clean the source and make it more portable.
 Only tested in NetBSD evbarm.
 
 trebol, 2017.
+
+Problems: needs -fPIC; has trouble linking against -lgen. (NetBSD/amd64)
+-- wiz 20171026

rtcmix/distinfo

@@ -153,3 +153,4 @@ SHA1 (patch-utils_Makefile) = 48b6d5217560cf6a2de29079291f9c1a242d0b69
 SHA1 (patch-utils_cmixplay.cpp) = a44a43bc115a42e2d780fba17d7e0402bbbae377
 SHA1 (patch-utils_head_Makefile) = 4e285f593c912958c409ae81be0865b65158d8b6
 SHA1 (patch-utils_resample_Makefile) = bcf2582dfb0a3a8e5464f488ac606a8fb35cea70
+SHA1 (patch-utils_scripts_sfconv) = b186edc3cc86ee071a0de7ebc66a2c3d14ba8db5

rtcmix/patches/patch-utils_scripts_sfconv

@@ -0,0 +1,13 @@
+$NetBSD$
+
+--- utils/scripts/sfconv.orig	2015-10-03 21:09:58.000000000 +0000
++++ utils/scripts/sfconv
+@@ -18,7 +18,7 @@ then
+    exit 1
+ fi
+ 
+-if [ $1 == $2 ]
++if [ $1 = $2 ]
+ then
+    echo "Your input file name is the same as your output file name!"
+    exit 1