fix pkgconfig dependencies (#30688)

pkgconfig is the correct dependency, pkg-config is a provider of it.

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

@@ -28,7 +28,7 @@ class Chameleon(CMakePackage, CudaPackage):
     variant('simgrid', default=False, when='runtime=starpu', description='Enable simulation mode through StarPU+SimGrid')
 
     # dependencies
-    depends_on("pkg-config", type='build')
+    depends_on("pkgconfig", type='build')
 
     with when("runtime=starpu"):
         depends_on("starpu")

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

@@ -68,7 +68,7 @@ class Starpu(AutotoolsPackage):
     variant('simgridmc', default=False, description='Enable SimGrid model checker support')
     variant('examples', default=True, description='Enable Examples')
 
-    depends_on("pkg-config", type='build')
+    depends_on("pkgconfig", type='build')
     depends_on('autoconf',  type='build')
     depends_on('automake',  type='build')
     depends_on('libtool',   type='build')