Ports/gdb: Add descriptions to all gdb patches and remove dead code

Before working on the gdb port some more, I wanted to get these patches
cleaned up to have a good base to build upon.

Ports/gdb/patches/0003-gdb-Add-build-support-for-SerenityOS.patch

@@ -0,0 +1,69 @@
+From e87fd74df2c7fcb4b146eb09b5b710a45003999a Mon Sep 17 00:00:00 2001
+From: Brian Gianforcaro <b.gianfo@gmail.com>
+Date: Sat, 19 Feb 2022 19:47:42 -0800
+Subject: [PATCH 3/4] gdb: Add build support for SerenityOS
+
+---
+ bfd/config.bfd       | 9 +++++++++
+ gdbsupport/configure | 2 +-
+ libiberty/configure  | 4 +++-
+ 3 files changed, 13 insertions(+), 2 deletions(-)
+
+diff --git a/bfd/config.bfd b/bfd/config.bfd
+index 30087e3..11dc114 100644
+--- a/bfd/config.bfd
++++ b/bfd/config.bfd
+@@ -634,6 +634,11 @@ case "${targ}" in
+     targ_selvecs=
+     targ64_selvecs=x86_64_elf64_vec
+     ;;
++  i[3-7]86-*-serenity*)
++    targ_defvec=i386_elf32_vec
++    targ_selvecs=
++    targ64_selvecs=x86_64_elf64_vec
++    ;;
+ #ifdef BFD64
+   x86_64-*-cloudabi*)
+     targ_defvec=x86_64_elf64_cloudabi_vec
+@@ -694,6 +699,10 @@ case "${targ}" in
+     targ_selvecs=i386_elf32_vec
+     want64=true
+     ;;
++  x86_64-*-serenity*)
++    targ_defvec=x86_64_elf64_vec
++    want64=true
++    ;;
+ #endif
+   i[3-7]86-*-lynxos*)
+     targ_defvec=i386_elf32_vec
+diff --git a/gdbsupport/configure b/gdbsupport/configure
+index a9dd02c..3c5bcf5 100755
+--- a/gdbsupport/configure
++++ b/gdbsupport/configure
+@@ -8934,7 +8934,7 @@ $as_echo "$gdb_cv_cxx_std_thread" >&6; }
+ 
+     # This check must be here, while LIBS includes any necessary
+     # threading library.
+-    for ac_func in pthread_sigmask pthread_setname_np
++    for ac_func in pthread_setname_np
+ do :
+   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ ac_fn_cxx_check_func "$LINENO" "$ac_func" "$as_ac_var"
+diff --git a/libiberty/configure b/libiberty/configure
+index fffb91d..defc239 100755
+--- a/libiberty/configure
++++ b/libiberty/configure
+@@ -6478,7 +6478,9 @@ case "${host}" in
+     $as_echo "#define HAVE_SYS_ERRLIST 1" >>confdefs.h
+ 
+     $as_echo "#define HAVE_SYS_NERR 1" >>confdefs.h
+-
++    ;;
++  *-*-serenity*)
++    $as_echo "#define HAVE_PSIGNAL 1" >>confdefs.h
+     ;;
+ esac
+ 
+-- 
+2.32.0
+