julia: don't look for the openlibm libraries when unneeded (#33626)

* julia: don't look for the openlibm libraries when unneeded
Cause spack to *not* check for the existence of the openlibm libraries (by adding it to the pkgs list) when ~openlibm is specified.
* [@spackbot] updating style on behalf of downloadico

Co-authored-by: downloadico <downloadico@users.noreply.github.com>

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

@@ -204,12 +204,13 @@ def setup_build_environment(self, env):
             "mpfr",
             "nghttp2",
             "openblas",
-            "openlibm",
             "pcre2",
             "suite-sparse",
             "utf8proc",
             "zlib",
         ]
+        if "+openlibm" in self.spec:
+            pkgs.append("openlibm")
         if self.spec.satisfies("@1.7.0:"):
             pkgs.append("libblastrampoline")
         for pkg in pkgs: