glibc: detect from "Free Software Foundation" not "gnu" (#44154)
which should be more generic
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		@@ -22,7 +22,7 @@ def _libc_from_ldd(ldd: str) -> Optional["spack.spec.Spec"]:
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    except Exception:
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        return None
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    if not re.search(r"\b(?:gnu|glibc|arm)\b", stdout, re.IGNORECASE):
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    if not re.search(r"\bFree Software Foundation\b", stdout):
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        return None
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    version_str = re.match(r".+\(.+\) (.+)", stdout)
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@@ -75,7 +75,7 @@ def libc_from_dynamic_linker(dynamic_linker: str) -> Optional["spack.spec.Spec"]
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            return spec
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        except Exception:
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            return None
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    elif re.search(r"\b(?:gnu|glibc|arm)\b", stdout, re.IGNORECASE):
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    elif re.search(r"\bFree Software Foundation\b", stdout):
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        # output is like "ld.so (...) stable release version 2.33."
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        match = re.search(r"version (\d+\.\d+(?:\.\d+)?)", stdout)
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        if not match:
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