Drop libarchive.pc

We want to ensure we always use libarchive from ports in the ports tree.
It simplifies ports maintainance and anyway libarchive.pc was not reflecting the
different way libarchive can be built in base

ObsoleteFiles.inc

@@ -38,6 +38,8 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20150719: Remove libarchive.pc
+OLD_FILES+=usr/libdata/pkgconfig/libarchive.pc
 # 20150705: Rename DTrace provider man pages.
 OLD_FILES+=usr/share/man/man4/dtrace-io.4.gz
 OLD_FILES+=usr/share/man/man4/dtrace-ip.4.gz

lib/libarchive/Makefile

@@ -37,12 +37,6 @@ CFLAGS+=	-DPPMD_32BIT
 .endif
 NO_WCAST_ALIGN.clang=
 
-.ifndef COMPAT_32BIT
-beforeinstall:
-	${INSTALL} -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
-		${.CURDIR}/libarchive.pc ${DESTDIR}${LIBDATADIR}/pkgconfig
-.endif
-
 .PATH: ${LIBARCHIVEDIR}/libarchive
 
 # Headers to be installed in /usr/include

lib/libarchive/libarchive.pc

@@ -1,12 +0,0 @@
-# $FreeBSD$
-prefix=/usr
-exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
-includedir=${prefix}/include
-
-Name: libarchive
-Description: library that can create and read several streaming archive formats
-Version: 3.1.2
-Cflags: -I${includedir}
-Libs: -L${libdir} -larchive
-Libs.private: -lz -lbz2 -llzma -lbsdxml -lcrypto