dev-libs/libxslt: Add blocker for util/pkgconfig before 0.29.2.

This fixes a breakage on ToT.

Pull request: https://github.com/gentoo/gentoo/pull/16976

BUG=chromium:1113478
TEST=./update_chroot

Change-Id: I79a0eb6e1af631b46858093d22ff6a5d995976ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2340393
Commit-Queue: Allen Webb <allenwebb@google.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Tested-by: Allen Webb <allenwebb@google.com>
diff --git a/dev-libs/libxslt/libxslt-1.1.34-r1.ebuild b/dev-libs/libxslt/libxslt-1.1.34-r2.ebuild
similarity index 100%
rename from dev-libs/libxslt/libxslt-1.1.34-r1.ebuild
rename to dev-libs/libxslt/libxslt-1.1.34-r2.ebuild
diff --git a/dev-libs/libxslt/libxslt-1.1.34.ebuild b/dev-libs/libxslt/libxslt-1.1.34.ebuild
index aad93bd..e0598e6 100644
--- a/dev-libs/libxslt/libxslt-1.1.34.ebuild
+++ b/dev-libs/libxslt/libxslt-1.1.34.ebuild
@@ -29,6 +29,7 @@
 "
 DEPEND="${RDEPEND}
 	virtual/pkgconfig
+	!!<dev-util/pkgconfig-0.29.2
 "
 
 MULTILIB_CHOST_TOOLS=(