libmspack: new port in archivers

archivers/libmspack/Portfile

@@ -0,0 +1,26 @@
+# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
+
+PortSystem          1.0
+PortGroup           github 1.0
+
+github.setup        kyz libmspack 1.11 v
+revision            0
+
+categories          archivers
+maintainers         nomaintainer
+license             LGPL
+
+description         Library supporting Microsoft compression formats
+long_description    The purpose of ${name} is to provide compressors and decompressors, \
+                    archivers and dearchivers for Microsoft compression formats.
+homepage            https://www.cabextract.org.uk/libmspack
+checksums           rmd160  5da46c6eff5059f954b22f41759c791d8c64faa2 \
+                    sha256  284e0e51fee991c40e8cbbc0f5e635f99722796a3642a14397989fc00b862f72 \
+                    size    408982
+github.tarball_from archive
+
+worksrcdir          ${worksrcpath}/${name}
+
+patchfiles          patch-xcode-gcc.diff
+
+use_autoreconf      yes

archivers/libmspack/files/patch-xcode-gcc.diff

@@ -0,0 +1,11 @@
+--- Makefile.am	2023-02-24 20:01:05.000000000 +0800
++++ Makefile.am	2024-07-28 22:20:05.000000000 +0800
+@@ -10,7 +10,7 @@
+ # default mspack_system and will fail without it -- any program with a call
+ # like "mspack_create_...(NULL)" expects a default mspack_system.
+ if GCC
+-AM_CFLAGS +=            -Wall -Wextra -Wno-unused-parameter -Wno-unused-result
++AM_CFLAGS +=            -Wall -Wextra -Wno-unused-parameter
+ endif
+ AM_CPPFLAGS =           -I$(srcdir)/mspack -I$(srcdir)/test
+