Drop references to $haikuVersion.

* Referring the current haiku version explicitly is not needed, since
  the RequiresUpdater takes care of setting the version of Haiku used
  for building a package.

dev-util/cppunit/cppunit-1.12.1.recipe

@@ -28,12 +28,12 @@ PROVIDES="
 	lib:libcppunit_1.12 = $portVersion compat >= 1.12
 	"
 REQUIRES="
-	haiku >= $haikuVersion
+	haiku
 	"
 BUILD_REQUIRES="
 	"
 BUILD_PREREQUIRES="
-	haiku_devel >= $haikuVersion
+	haiku_devel
 	cmd:libtoolize
 	cmd:autoreconf
 	cmd:g++