Add a minimal size release variant about dps-for-iot

[malsbat]

#102 has the following impact for me:

release:

$ ls -lh build/dist/lib/libdps_shared.so.0.9.0 
-rwxr-xr-x. 1 tmalsbar lock 3.2M May 23 11:46 build/dist/lib/libdps_shared.so.0.9.0
$ size build/dist/lib/libdps_shared.so.0.9.0 
   text	   data	    bss	    dec	    hex	filename
 589324	   9632	  11121	 610077	  94f1d	build/dist/lib/libdps_shared.so.0.9.0

min-size-release:

$ ls -lh build/dist/lib/libdps_shared.so.0.9.0 
-rwxr-xr-x. 1 tmalsbar lock 255K May 23 11:47 build/dist/lib/libdps_shared.so.0.9.0
$ size build/dist/lib/libdps_shared.so.0.9.0 
   text	   data	    bss	    dec	    hex	filename
 252609	   5440	   9729	 267778	  41602	build/dist/lib/libdps_shared.so.0.9.0

[AAlon]

For reference, the stock build of libdps_shared.so.0.9.0 on my EC2 instance weighs 3.0MB. With all the flags above it comes down to 599K.

[AAlon]

Nice!

[malsbat]

#102 has been merged