Don't search /usr and so on for libraries by default to avoid host contamination.

Upstream-Status: Inapproprite (As the code stands, this is a hack)
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/numpy/distutils/system_info.py b/numpy/distutils/system_info.py
index bac90fb..a63d796 100644
--- a/numpy/distutils/system_info.py
+++ b/numpy/distutils/system_info.py
@@ -191,41 +191,12 @@ if sys.platform == 'win32':
     default_x11_lib_dirs = []
     default_x11_include_dirs = []
 else:
-    default_lib_dirs = libpaths(['/usr/local/lib', '/opt/lib', '/usr/lib',
-                                 '/opt/local/lib', '/sw/lib'], platform_bits)
-    default_include_dirs = ['/usr/local/include',
-                            '/opt/include', '/usr/include',
-                            # path of umfpack under macports
-                            '/opt/local/include/ufsparse',
-                            '/opt/local/include', '/sw/include',
-                            '/usr/include/suitesparse']
-    default_src_dirs = ['.', '/usr/local/src', '/opt/src', '/sw/src']
-
-    default_x11_lib_dirs = libpaths(['/usr/X11R6/lib', '/usr/X11/lib',
-                                     '/usr/lib'], platform_bits)
-    default_x11_include_dirs = ['/usr/X11R6/include', '/usr/X11/include',
-                                '/usr/include']
-
-    if os.path.exists('/usr/lib/X11'):
-        globbed_x11_dir = glob('/usr/lib/*/libX11.so')
-        if globbed_x11_dir:
-            x11_so_dir = os.path.split(globbed_x11_dir[0])[0]
-            default_x11_lib_dirs.extend([x11_so_dir, '/usr/lib/X11'])
-            default_x11_include_dirs.extend(['/usr/lib/X11/include',
-                                             '/usr/include/X11'])
-
-    import subprocess as sp
-    try:
-        p = sp.Popen(["gcc", "-print-multiarch"], stdout=sp.PIPE,
-                stderr=open(os.devnull, 'w'))
-    except OSError:
-        pass # gcc is not installed
-    else:
-        triplet = str(p.communicate()[0].decode().strip())
-        if p.returncode == 0:
-            # gcc supports the "-print-multiarch" option
-            default_x11_lib_dirs += [os.path.join("/usr/lib/", triplet)]
-            default_lib_dirs += [os.path.join("/usr/lib/", triplet)]
+    default_lib_dirs = libpaths(['/deadir/lib'], platform_bits)
+    default_include_dirs = ['/deaddir/include']
+    default_src_dirs = ['.', '/deaddir/src']
+
+    default_x11_lib_dirs = libpaths(['/deaddir/lib'], platform_bits)
+    default_x11_include_dirs = ['/deaddir/include']
 
 if os.path.join(sys.prefix, 'lib') not in default_lib_dirs:
     default_lib_dirs.insert(0, os.path.join(sys.prefix, 'lib'))