move iu.opts to no-iu.opts, change to --disable-iu

osmo-msc and osmo-sgsn have moved to --enable-iu by default.

Depends: I1c937cb0dea001e501714cf71bfc91ec5c3cda9f (osmo-msc)
         I04b07ffead5d5394651d80711d2de06162eeed14 (osmo-sgsn)
Change-Id: I9a590b9cb9d9318c822e33e8432f3f8e5eb6779f

README

@@ -8,15 +8,23 @@ The idea is to have all your Osmocom git clones in ./src, while keeping one or
 more separate build trees in ./make-*.
 
 Run ./gen_makefile.py with a choice of projects (2G only or also 3G?)
-and a choice of configure options, for example:
+and a choice of configure options.
 
-  ./gen_makefile.py 3G+2G.deps default.opts iu.opts
+Examples:
+
+Full 2G and 3G support:
+
+  ./gen_makefile.py 3G+2G.deps default.opts
+
+2G only (requires to pass no-iu.opts), and a custom dir name of 'make-2G':
+
+  ./gen_makefile.py 2G.deps default.opts no-iu.opts -m make-2G
 
 This generates a new dir containing a Makefile. When you run make in it, this
 will clone the source trees (if not present yet) and build all of them in the
 right order:
 
-  cd make-3G+2G-default+iu
+  cd make-3G+2G-default
   make
 
 If you make modifications in one of the source trees, this Makefile will pick

iu.opts

@@ -1,2 +0,0 @@
-osmo-msc --enable-iu
-osmo-sgsn --enable-iu

no-iu.opts

@@ -0,0 +1,2 @@
+osmo-msc --disable-iu
+osmo-sgsn --disable-iu