[MacPorts] #55857: boost @1.66.0_0 +universal has no i386 symbols

[MacPorts]

#55857: boost @1.66.0_0 +universal has no i386 symbols
------------------------------+-------------------
 Reporter:  devernay          |      Owner:
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:
 Keywords:  i386 snowleopard  |       Port:  boost
------------------------------+-------------------
 I installed `boost @1.66.0_0+no_single+no_static+python27+universal` on a
 libc++-based snow leopard (10.6) system, building with macports-clang-5.0,
 and it seems that installed libraries do not contain any i386 symbols:
 {{{
 root at mistral:~$ file /opt/local/lib/libboost_regex-mt.dylib
 /opt/local/lib/libboost_regex-mt.dylib: Mach-O universal binary with 2
 architectures
 /opt/local/lib/libboost_regex-mt.dylib (for architecture i386): Mach-O
 dynamically linked shared library i386
 /opt/local/lib/libboost_regex-mt.dylib (for architecture x86_64):
 Mach-O 64-bit dynamically linked shared library x86_64
 $ nm -arch i386 /opt/local/lib/libboost_regex-mt.dylib
          U dyld_stub_binder
 $ nm -arch x86_64 /opt/local/lib/libboost_regex-mt.dylib
 0000000000099c50 s GCC_except_table0
 0000000000099e08 s GCC_except_table0
 0000000000099f04 s GCC_except_table0
 ... (lots of symbols)
 }}}

 reinstalling didn't fix this.

 `boost at 1.65.1_3+no_single+no_static+python27+universal` had no issue.

 Cc-ing kencu who may be able to test this on his system.

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Ticket URL: <https://trac.macports.org/ticket/55857>
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