Move definition of enable_check macro

This was in the wrong location, making the comment about the lib dir
look out of place.

facter.spec

@@ -1,17 +1,17 @@
 # F-17 and above have ruby-1.9.x, and place libs in a different location
-# The checks also fail on older releases, due to an older mocha gem, it appears
-%if (0%{?fedora} >= 17 && 0%{?fedora} <= 19)
-%global enable_check 1
-%else
-%global enable_check 0
-%endif
-
 %if 0%{?fedora} >= 17
 %global facter_libdir   %(ruby -rrbconfig -e 'puts RbConfig::CONFIG["vendorlibdir"]')
 %else
 %global facter_libdir   %(ruby -rrbconfig -e 'puts RbConfig::CONFIG["sitelibdir"]')
 %endif
 
+# Only enable checks on F-19, other releases fail for various reasons
+%if (0%{?fedora} >= 17 && 0%{?fedora} <= 19)
+%global enable_check 1
+%else
+%global enable_check 0
+%endif
+
 %global ruby_version    %(ruby -rrbconfig -e 'puts RbConfig::CONFIG["ruby_version"]')
 
 # There is nothing useful in debuginfo, facter is only an arch package to