fix spack-build usages (#18846)

var/spack/repos/builtin/packages/branson/package.py

@@ -42,6 +42,6 @@ def cmake_args(self):
     def install(self, spec, prefix):
         mkdir(prefix.bin)
         mkdir(prefix.doc)
-        install('../spack-build/BRANSON', prefix.bin)
+        install(join_path(self.build_directory, 'BRANSON'), prefix.bin)
         install('LICENSE.md', prefix.doc)
         install('README.md', prefix.doc)

var/spack/repos/builtin/packages/hacckernels/package.py

@@ -23,4 +23,4 @@ class Hacckernels(CMakePackage):
     def install(self, spec, prefix):
         mkdirp(prefix.bin)
         install('README', prefix)
-        install('../spack-build/HACCKernels', prefix.bin)
+        install(join_path(self.build_directory, 'HACCKernels'), prefix.bin)

var/spack/repos/builtin/packages/kripke/package.py

@@ -42,4 +42,4 @@ def install(self, spec, prefix):
         # Kripke does not provide install target, so we have to copy
         # things into place.
         mkdirp(prefix.bin)
-        install('../spack-build/bin/kripke.exe', prefix.bin)
+        install(join_path(self.build_directory, 'bin/kripke.exe'), prefix.bin)