scons incorrectly builds projects, serf1 unexpectedly changed dylib versions with just a revbump for OpenSSL

[jeremyhu (Jeremy Huddleston Sequoia)]

serf1 was recently revbumped to rebuild against an updated OpenSSL. In doing so, other ports on my system broke because the dylib version of libserf changed:

/tmp/r1 $ tar xjf .../serf1-1.3.4_1+universal.darwin_15.i386-x86_64.tbz2 

/tmp/r1 $ otool -L opt/local/lib/libserf-1.dylib 
opt/local/lib/libserf-1.dylib:
	/opt/local/lib/libserf-1.dylib (compatibility version 0.0.0, current version 0.0.0)
	...

/tmp/r0 $ tar xjf .../serf1-1.3.4_0+universal.darwin_15.i386-x86_64.tbz2 

/tmp/r0 $ otool -L opt/local/lib/libserf-1.dylib 
opt/local/lib/libserf-1.dylib:
	/opt/local/lib/libserf-1.dylib (compatibility version 1.3.4, current version 1.3.4)
	...

---

Timestamps of when they were built:

-rw-r--r-- 1 root admin 424529 Oct 17 00:33 serf1-1.3.4_0+universal.darwin_15.i386-x86_64.tbz2 -rw-r--r-- 1 root admin 410869 Mar 10 11:09 serf1-1.3.4_1+universal.darwin_15.i386-x86_64.tbz2

The only change to the serf1 port since Oct 17 was the revbump.

However, scons was recently updated from 2.3.4 to 2.4.1, and that certainly seems like the likley cause. I'll give a try reverting it.