ncmpcpp: switch to boost181 to fix gcc build, revbump

audio/ncmpcpp/Portfile

@@ -3,9 +3,15 @@
 PortSystem          1.0
 PortGroup           boost 1.0
 
+# Boost 1.76 has a bug which breaks builds with modern gcc.
+# configure: error: cannot find boost/math/special_functions.hpp
+# This happens due to the following error:
+# /opt/local/include/gcc13/c++/utility: error: '__and_' was not declared in this scope; did you mean 'std::__and_'?
+boost.version       1.81
+
 name                ncmpcpp
 version             0.9.2
-revision            4
+revision            5
 checksums           rmd160  112c518bd0b7f1467ba7949d2f25ca19c64abcf2 \
                     sha256  faabf6157c8cb1b24a059af276e162fa9f9a3b9cd3810c43b9128860c9383a1b \
                     size    486266
@@ -19,7 +25,6 @@ long_description    Ncmpcpp has UI very similar to ncmpc's one, but it provides
                     sort playlist, local filesystem browser and other minor functions.
 homepage            https://rybczak.net/ncmpcpp/
 license             GPL-2+
-platforms           darwin
 master_sites        ${homepage}stable/
 use_bzip2           yes