Add Gentoo Portage host configuration

package.use/kernel

@@ -0,0 +1,7 @@
+sys-boot/limine -bios -bios-cd -bios-pxe -uefi-aarch64 -uefi-cd -uefi-ia32 -uefi-loongarch64 -uefi-riscv64 uefi-x86-64
+# required by sys-kernel/cachyos-kernel-7.2.8::cachy[autofdo]
+# required by virtual/dist-kernel-7.2.8_p0::cachy
+# required by sys-kernel/gentoo-kernel-bin-6.18.50::gentoo
+# required by @selected
+# required by @world (argument)
+>=dev-util/perf-6.19.12 libpfm