lm-sensors: respect compiler choice (#38890)

Currently lm-sensors defaults to the compiler specified in the Makefile
(gcc) rather than the one specified in the spec. This patch appends the
CC flag to the make invocation with the spec compiler to fix this
behavior.

var/spack/repos/builtin/packages/lm-sensors/package.py

@@ -31,6 +31,14 @@ class LmSensors(MakefilePackage):
     depends_on("flex", type="build")
     depends_on("perl", type="run")
 
+    @property
+    def build_targets(self):
+        targets = []
+
+        targets.append("CC={0}".format(spack_cc))
+
+        return targets
+
     def install(self, spec, prefix):
         make("install", "PREFIX={0}".format(prefix), "ETCDIR={0}/etc".format(prefix))