Revert "toolchain/gdb: update to version 8.0.1"

Since version 8.0, gdb requires at least gcc 4.8. Unfortunately some of
the buildbot slaves don't meet this requirement, and fail to build LEDE
after the gdb upgrade. Revert to the previous gdb version for now.

This reverts commit 592abe9ef53f921554d48085d6482d4507b3e142.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

toolchain/gdb/Makefile

@@ -17,11 +17,11 @@ PKG_HASH:=f47930161e9e99c46ab018dabbf56024739dda29c51f92495eaa0d4d7e3511f6
 GDB_DIR:=binutils-$(PKG_NAME)-$(PKG_VERSION)
 PATCH_DIR:=./patches-arc
 else
-PKG_VERSION:=8.0.1
+PKG_VERSION:=7.12.1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@GNU/gdb
-PKG_HASH:=3dbd5f93e36ba2815ad0efab030dcd0c7b211d7b353a40a53f4c02d7d56295e3
+PKG_HASH:=4607680b973d3ec92c30ad029f1b7dbde3876869e6b3a117d8a7e90081113186
 GDB_DIR:=$(PKG_NAME)-$(PKG_VERSION)
 endif
 

toolchain/gdb/patches/110-no_testsuite.patch

@@ -1,6 +1,6 @@
 --- a/gdb/configure
 +++ b/gdb/configure
-@@ -869,8 +869,7 @@ MAKEINFOFLAGS
+@@ -874,8 +874,7 @@ MAKEINFOFLAGS
  YACC
  YFLAGS
  XMKMF'
@@ -10,7 +10,7 @@
  multi-ice
  gdbserver'
  
-@@ -6473,7 +6472,7 @@ $as_echo "$with_auto_load_safe_path" >&6
+@@ -5617,7 +5616,7 @@ $as_echo "$with_auto_load_safe_path" >&6
  
  
  

toolchain/gdb/patches/120-fix-compile-flag-mismatch.patch

@@ -1,6 +1,6 @@
 --- a/gdb/gdbserver/configure
 +++ b/gdb/gdbserver/configure
-@@ -2469,7 +2469,7 @@ $as_echo "$as_me: error: \`$ac_var' was 
+@@ -2476,7 +2476,7 @@ $as_echo "$as_me: error: \`$ac_var' was
        ac_cache_corrupted=: ;;
      ,);;
      *)