Revert "clock_gettime_spec.rb: exclude invalid clocks for Solaris"

* This reverts commit a7edd05f7d.
* I prefer to exclude Solaris, I want to keep testing these clocks on Linux/macOS.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66655 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/process/clock_gettime_spec.rb

@@ -2,19 +2,13 @@ require_relative '../../spec_helper'
 
 describe "Process.clock_gettime" do
   platform_is_not :windows do
-    invalid_clocks = [
+    Process.constants.select { |c|
+      c.to_s.start_with?('CLOCK_') &&
       # These require CAP_WAKE_ALARM and are not documented in clock_gettime(),
       # they return EINVAL if the permission is not granted.
-      :CLOCK_BOOTTIME_ALARM,
-      :CLOCK_REALTIME_ALARM,
-      # These don't work on Solaris
-      :CLOCK_PROCESS_CPUTIME_ID,
-      :CLOCK_THREAD_CPUTIME_ID,
-      :CLOCK_VIRTUAL,
-      :CLOCK_PROF,
-    ]
-
-    Process.constants.select { |c| c.to_s.start_with?('CLOCK_') && !invalid_clocks.include?(c) }.each do |c|
+      c != :CLOCK_BOOTTIME_ALARM &&
+      c != :CLOCK_REALTIME_ALARM
+    }.each do |c|
       it "can be called with Process::#{c}" do
         value = Process.const_get(c)
         Process.clock_gettime(value).should be_an_instance_of(Float)