common: Get rid of arch-specific include

As @liuqun pointed out on #44, the right way to fix the weird missing
include issue on Ubuntu is to install the gcc-multilib package. So add that
to setup_instructions, and get rid of the additional arch-specific include
path.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Author: tohojo

common/common.mk

@@ -40,8 +40,6 @@ EXTRA_DEPS +=
 KERN_USER_H ?= $(wildcard common_kern_user.h)
 
 CFLAGS ?= -I$(LIBBPF_DIR)/build/usr/include/ -g
-# Extra include for Ubuntu issue #44
-CFLAGS += -I/usr/include/x86_64-linux-gnu
 CFLAGS += -I../headers/
 LDFLAGS ?= -L$(LIBBPF_DIR)
 

setup_dependencies.org

@@ -11,12 +11,15 @@ this document and install the needed software packages.
 - [[#dependencies][Dependencies]]
   - [[#packages-on-fedora][Packages on Fedora]]
   - [[#packages-on-debianubuntu][Packages on Debian/Ubuntu]]
+  - [[#packages-on-opensuse][Packages on openSUSE]]
 - [[#kernel-headers-dependency][Kernel headers dependency]]
   - [[#packages-on-fedora-1][Packages on Fedora]]
   - [[#packages-on-debianubuntu-1][Packages on Debian/Ubuntu]]
+  - [[#packages-on-opensuse-1][Packages on openSUSE]]
 - [[#recommended-tools][Recommended tools]]
   - [[#packages-on-fedora-2][Packages on Fedora]]
   - [[#packages-on-debianubuntu-2][Packages on Debian/Ubuntu]]
+  - [[#packages-on-opensuse-2][Packages on openSUSE]]
 
 * Based on libbpf
 
@@ -82,7 +85,7 @@ Note that you need to do this in the shell you are using to load programs
 On Debian and Ubuntu installations, install the dependencies like this:
 
 #+begin_example
- $ sudo apt install clang llvm libelf-dev
+ $ sudo apt install clang llvm libelf-dev gcc-multilib
 #+end_example
 
 To install the 'perf' utility, run this on Debian: