internal/rosa/package: migrate nss

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/cmake.go

@@ -6,8 +6,7 @@ import (
 	"strings"
 )
 
-// CMake is the package used by [CMakeHelper].
-var CMake = H("cmake")
+var _cmake = H("cmake")
 
 // CMakeHelper is the [CMake] build system helper.
 type CMakeHelper struct {
@@ -35,9 +34,9 @@ var _ Helper = new(CMakeHelper)
 // extra returns a hardcoded slice of [CMake] and [Ninja].
 func (attr *CMakeHelper) extra(int) P {
 	if attr != nil && attr.Make {
-		return P{CMake, Make}
+		return P{_cmake, _make}
 	}
-	return P{CMake, Ninja}
+	return P{_cmake, _ninja}
 }
 
 // wantsChmod returns false.