component/*: use specific perl

${perl:location} is now a perl without any package, components using
perl with one specific package must switch to using the perl with the
dependent CPAN packages installed.

component/gtk-3/buildout.cfg

@@ -15,12 +15,10 @@ extends =
 recipe = slapos.recipe.cmmi
 url =http://ftp.gnome.org/pub/gnome/core/3.22/3.22.2/sources/at-spi2-core-2.22.0.tar.xz
 md5sum = 3da5fe62a653e49dad1c47f9a46fee56
-depends =
-  ${perl-XML-Parser:location}
 configure-options =
   --disable-gtk-doc-html
 environment =
-  PATH=${dbus:location}/bin:${gettext:location}/bin:${glib:location}/bin:${intltool:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
+  PATH=${dbus:location}/bin:${gettext:location}/bin:${glib:location}/bin:${intltool:location}/bin:${perl-XML-Parser:perl-PATH}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${dbus:location}/lib/pkgconfig:${glib:location}/lib/pkgconfig:${pcre:location}/lib/pkgconfig
   CPPFLAGS=-I${inputproto:location}/include -I${kbproto:location}/include -I${libX11:location}/include -I${libXi:location}/include -I${libXtst:location}/include -I${xextproto:location}/include -I${xproto:location}/include
   LDFLAGS=-L${libX11:location}/lib -Wl,-rpath=${libX11:location}/lib -L${libXi:location}/lib -Wl,-rpath=${libXi:location}/lib -L${libXtst:location}/lib -Wl,-rpath=${libXtst:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib

component/intltool/buildout.cfg

@@ -15,8 +15,6 @@ md5sum = 12e517cac2b57a0121cda351570f1e63
 patch-options = -p1
 patches =
   ${:_profile_base_location_}/intltool-0.51.0.regexp.patch#3e7736d5ce7876e9a8d078c35e7f327b
-depends =
-  ${perl-XML-Parser:location}
 environment =
-  PATH=${patch:location}/bin:${perl:location}/bin:${gettext:location}/bin:${pkgconfig:location}/bin:%(PATH)s
+  PATH=${patch:location}/bin:${perl-XML-Parser:perl-PATH}:${gettext:location}/bin:${pkgconfig:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${perl:location}/lib/pkgconfig

component/systemd/buildout.cfg

@@ -5,7 +5,6 @@ extends =
   ../gperf/buildout.cfg
   ../intltool/buildout.cfg
   ../libcap/buildout.cfg
-  ../perl/buildout.cfg
   ../perl-XML-Parser/buildout.cfg
   ../pkgconfig/buildout.cfg
   ../util-linux/buildout.cfg
@@ -16,12 +15,10 @@ recipe = slapos.recipe.cmmi
 # XXX This version requires Linux kernel >= 3.7.
 url = https://www.freedesktop.org/software/systemd/systemd-221.tar.xz
 md5sum = b4d5a253841cf28a98b7ec99c45e3716
-depends =
-  ${perl-XML-Parser:location}
 location = ${buildout:parts-directory}/${:_buildout_section_name_}
 make-options = rootprefix=${:location} SYSTEM_SYSVINIT_PATH=${:location}/etc/init.d
 environment =
-  PATH=${coreutils:location}/bin:${gettext:location}/bin:${gperf:location}/bin:${intltool:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
+  PATH=${coreutils:location}/bin:${gettext:location}/bin:${gperf:location}/bin:${intltool:location}/bin:${perl-XML-Parser:perl-PATH}/bin:${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
   CPPFLAGS=-I${libcap:location}/include -I${util-linux:location}/include
   LDFLAGS=-L${libcap:location}/lib -Wl,-rpath=${libcap:location}/lib -L${util-linux:location}/lib -Wl,-rpath=${util-linux:location}/lib
   PKG_CONFIG_PATH=${util-linux:location}/lib/pkgconfig

component/xorg/buildout.cfg

@@ -14,6 +14,7 @@ extends =
   ../openssl/buildout.cfg
   ../patch/buildout.cfg
   ../perl/buildout.cfg
+  ../perl-XML-Parser/buildout.cfg
   ../pkgconfig/buildout.cfg
   ../zlib/buildout.cfg
 
@@ -314,15 +315,13 @@ environment =
 recipe = slapos.recipe.cmmi
 url = http://www.x.org/releases/X11R7.7/src/everything/xkeyboard-config-2.6.tar.bz2
 md5sum = e7e31da9adb56ba52b5c18226b8cbef3
-depends =
-  ${perl-XML-Parser:location}
 configure-options =
   --disable-static
   --enable-shared
   --enable-compat-rules
   --with-xkb-rules-symlink=xfree86
 environment =
-  PATH=${gettext:location}/bin:${intltool:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:${xkbcomp:location}/bin:%(PATH)s
+  PATH=${gettext:location}/bin:${intltool:location}/bin:${perl-XML-Parser:perl-PATH}:${pkgconfig:location}/bin:${xkbcomp:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${libX11:location}/lib/pkgconfig:${xproto:location}/lib/pkgconfig:${kbproto:location}/lib/pkgconfig:${libxcb:location}/lib/pkgconfig:${xorg-libpthread-stubs:location}/lib/pkgconfig:${libXau:location}/lib/pkgconfig
 
 [xkbcomp]