Work around rpm braindamage: you can't have "%" in comments!?

ghc.spec

@@ -9,10 +9,10 @@
 # the misery, do a complete build once using "rpmbuild -bc", then copy
 # your built tree to a directory of the same name suffixed with
 # ".built", using "cp -al".  Finally, set this variable, and it will
-# copy the already-built tree into place during %build instead of
+# copy the already-built tree into place during build instead of
 # actually doing the build.
 #
-# Obviously, this can only work if you leave the %build section
+# Obviously, this can only work if you leave the build section
 # completely untouched between builds.
 %define package_debugging 0