touch: Always expect XInput2 availability.

build/linux/system.gyp

Index: build/linux/system.gyp
diff --git a/build/linux/system.gyp b/build/linux/system.gyp
index 346fe22dab98ef73e645b3eec4f3f3b07e085d32..d61ac62cbab304d91f07471f630834b87992855f 100644
--- a/build/linux/system.gyp
+++ b/build/linux/system.gyp
@@ -264,30 +264,13 @@
           },
           'link_settings': {
             'ldflags': [
-              '<!@(<(pkg-config) --libs-only-L --libs-only-other x11)',
+              '<!@(<(pkg-config) --libs-only-L --libs-only-other x11 xi)',
             ],
             'libraries': [
-              '<!@(<(pkg-config) --libs-only-l x11)',
+              '<!@(<(pkg-config) --libs-only-l x11 xi)',
             ],
           },
       }],
-      # When XInput2 is available (i.e. inputproto version is 2.0), the
-      # pkg-config command will succeed, so the output will be empty.
-      ['"<!@(<(pkg-config) --atleast-version=2.0 inputproto || echo $?)"==""', {
-        'direct_dependent_settings': {
-          'defines': [
-            'HAVE_XINPUT2',
-          ],
-        },
-        'link_settings': {
-          'ldflags': [
-            '<!@(<(pkg-config) --libs-only-L --libs-only-other xi)',
-          ],
-          'libraries': [
-            '<!@(<(pkg-config) --libs-only-l xi)',
-          ],
-        }
-      }],
       ],
     },
     {