pygoscelis: Enable bpf for systemd, add new build dep

- enable CONFIG_BPF_LSM=Y
- CONFIG_DEBUG_INFO_BTF=Y, which needs dev-util/pahole.

Let's add it to try that fancy new shit of 2019 / systemd 243 ;)

Seriously, let's try eBPF support in systemd units as Gentoo/Linux
gained access by USE flags recently. Unfortunately it leads to some
disabled hardending features (randstruct). Let’s live with it for now.

pygoscelis-config

@@ -18,7 +18,7 @@ CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT=y
 CONFIG_TOOLS_SUPPORT_RELR=y
 CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CC_HAS_NO_PROFILE_FN_ATTR=y
-CONFIG_PAHOLE_VERSION=0
+CONFIG_PAHOLE_VERSION=127
 CONFIG_IRQ_WORK=y
 CONFIG_BUILDTIME_TABLE_SORT=y
 CONFIG_THREAD_INFO_IN_TASK=y
@@ -121,7 +121,7 @@ CONFIG_BPF_JIT_ALWAYS_ON=y
 CONFIG_BPF_JIT_DEFAULT_ON=y
 CONFIG_BPF_UNPRIV_DEFAULT_OFF=y
 # CONFIG_BPF_PRELOAD is not set
-# CONFIG_BPF_LSM is not set
+CONFIG_BPF_LSM=y
 # end of BPF subsystem
 
 CONFIG_PREEMPT_BUILD=y
@@ -5157,7 +5157,6 @@ CONFIG_LSM="landlock,lockdown,yama,loadpin,safesetid,integrity,bpf"
 #
 # Kernel hardening options
 #
-CONFIG_GCC_PLUGIN_STRUCTLEAK=y
 
 #
 # Memory initialization
@@ -5168,7 +5167,6 @@ CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO=y
 # CONFIG_INIT_STACK_NONE is not set
 # CONFIG_INIT_STACK_ALL_PATTERN is not set
 CONFIG_INIT_STACK_ALL_ZERO=y
-# CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE is not set
 CONFIG_GCC_PLUGIN_STACKLEAK=y
 # CONFIG_GCC_PLUGIN_STACKLEAK_VERBOSE is not set
 CONFIG_STACKLEAK_TRACK_MIN_SIZE=100
@@ -5187,11 +5185,9 @@ CONFIG_LIST_HARDENED=y
 CONFIG_BUG_ON_DATA_CORRUPTION=y
 # end of Hardening of kernel data structures
 
-# CONFIG_RANDSTRUCT_NONE is not set
+CONFIG_RANDSTRUCT_NONE=y
 # CONFIG_RANDSTRUCT_FULL is not set
-CONFIG_RANDSTRUCT_PERFORMANCE=y
+# CONFIG_RANDSTRUCT_PERFORMANCE is not set
-CONFIG_RANDSTRUCT=y
-CONFIG_GCC_PLUGIN_RANDSTRUCT=y
 # end of Kernel hardening options
 # end of Security options
 
@@ -5624,11 +5620,23 @@ CONFIG_DEBUG_MISC=y
 #
 # Compile-time checks and compiler options
 #
+CONFIG_DEBUG_INFO=y
 CONFIG_AS_HAS_NON_CONST_ULEB128=y
-CONFIG_DEBUG_INFO_NONE=y
+# CONFIG_DEBUG_INFO_NONE is not set
-# CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT is not set
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
 # CONFIG_DEBUG_INFO_DWARF4 is not set
 # CONFIG_DEBUG_INFO_DWARF5 is not set
+# CONFIG_DEBUG_INFO_REDUCED is not set
+CONFIG_DEBUG_INFO_COMPRESSED_NONE=y
+# CONFIG_DEBUG_INFO_COMPRESSED_ZLIB is not set
+# CONFIG_DEBUG_INFO_COMPRESSED_ZSTD is not set
+# CONFIG_DEBUG_INFO_SPLIT is not set
+CONFIG_DEBUG_INFO_BTF=y
+CONFIG_PAHOLE_HAS_SPLIT_BTF=y
+CONFIG_PAHOLE_HAS_LANG_EXCLUDE=y
+CONFIG_DEBUG_INFO_BTF_MODULES=y
+# CONFIG_MODULE_ALLOW_BTF_MISMATCH is not set
+# CONFIG_GDB_SCRIPTS is not set
 CONFIG_FRAME_WARN=2048
 CONFIG_STRIP_ASM_SYMS=y
 # CONFIG_READABLE_ASM is not set
@@ -5936,6 +5944,5 @@ CONFIG_GENTOO_LINUX_INIT_SYSTEMD=y
 # end of Support for init systems, system and service managers
 
 CONFIG_GENTOO_KERNEL_SELF_PROTECTION=y
-CONFIG_GENTOO_KERNEL_SELF_PROTECTION_COMMON=y
 CONFIG_GENTOO_PRINT_FIRMWARE_INFO=y
 # end of Gentoo Linux