autotools: replace PKGCONFIGDIR with PKG_DEFAULT_PATH

Makefile.am

@@ -4,7 +4,7 @@ datadir                = @datadir@
 includedir             = @includedir@
 system_includedir      = @SYSTEM_INCLUDEDIR@
 system_libdir          = @SYSTEM_LIBDIR@
-pkg_default_dir        = @PKGCONFIGDIR@
+pkg_default_dir        = @PKG_DEFAULT_PATH@
 pkgconfigdir           = $(libdir)/pkgconfig
 nodist_pkgconfig_DATA  = libpkgconf.pc
 

configure.ac

@@ -24,10 +24,10 @@ LT_INIT
 AC_SYS_LARGEFILE
 
 AC_ARG_WITH([pkg-config-dir],[AC_HELP_STRING([--with-pkg-config-dir],[specify
-	     the place where pc files will be found])],PKGCONFIGDIR="$withval",
-	     PKGCONFIGDIR="${libdir}/pkgconfig:${datadir}/pkgconfig")
+	     the place where pc files will be found])],PKG_DEFAULT_PATH="$withval",
+	     PKG_DEFAULT_PATH="${libdir}/pkgconfig:${datadir}/pkgconfig")
 
-AC_SUBST([PKGCONFIGDIR])
+AC_SUBST([PKG_DEFAULT_PATH])
 
 AC_ARG_WITH([system-libdir],[AC_HELP_STRING([--with-system-libdir],[specify the
 	     system library directory (default LIBDIR)])],

tests/test_env.sh.in

@@ -31,7 +31,7 @@ esac
 prefix="@prefix@"
 exec_prefix="@exec_prefix@"
 datarootdir="@datarootdir@"
-pcpath="@PKGCONFIGDIR@"
+pcpath="@PKG_DEFAULT_PATH@"
 
 tests_init()
 {