libcryptopp @5.6.2: also install the dynamic library

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$ sudo port install libcryptopp
--->  Fetching archive for libcryptopp
--->  Attempting to fetch libcryptopp-5.6.2_0.darwin_13.x86_64.tbz2 from http://mse.uk.packages.macports.org/sites/packages.macports.org/libcryptopp
--->  Attempting to fetch libcryptopp-5.6.2_0.darwin_13.x86_64.tbz2.rmd160 from http://mse.uk.packages.macports.org/sites/packages.macports.org/libcryptopp
--->  Installing libcryptopp @5.6.2_0
--->  Activating libcryptopp @5.6.2_0
--->  Cleaning libcryptopp
--->  Updating database of binaries
--->  Scanning binaries for linking errors
--->  No broken files found.
$ port contents libcryptopp | grep lib/
  /opt/local/lib/libcryptopp.a
$ gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix
$ uname -a
Darwin mb.local 13.4.0 Darwin Kernel Version 13.4.0: Wed Mar 18 16:20:14 PDT 2015; root:xnu-2422.115.14~1/RELEASE_X86_64 x86_64