MangoHud: Adds missing multilib-32bit vulkan layer

Without this, using MangoHud-32bit on x86_64 hosts prevents some
32bit games from starting (E.g. Black Mesa). See [this issue][1]
for details.

[1]: https://github.com/flightlessmango/MangoHud/issues/991

srcpkgs/MangoHud/template

@@ -1,7 +1,7 @@
 # Template file for 'MangoHud'
 pkgname=MangoHud
 version=0.7.2
-revision=1
+revision=2
 build_style=meson
 configure_args="-Dwith_xnvctrl=disabled
  -Dwith_nvml=disabled -Duse_system_spdlog=enabled"
@@ -15,6 +15,7 @@ homepage="https://github.com/flightlessmango/MangoHud"
 distfiles="https://github.com/flightlessmango/MangoHud/releases/download/v${version}/MangoHud-v${version}-Source-DFSG.tar.xz"
 checksum=39d41ff564cd46b99a8514d35ff0cc1cd4ec5ab093347ca552bd7f7572a4064f
 python_version=3
+lib32files="/usr/share/vulkan/implicit_layer.d/MangoHud.x86.json"
 
 if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
 	configure_args+=" -Ddynamic_string_tokens=false"