Add a "fork" of musl as //fusl.

fusl/src/fenv/fenv.c

Index: fusl/src/fenv/fenv.c
diff --git a/fusl/src/fenv/fenv.c b/fusl/src/fenv/fenv.c
new file mode 100644
index 0000000000000000000000000000000000000000..5588dad95f428908d7d805dc8b6e1df22970374e
--- /dev/null
+++ b/fusl/src/fenv/fenv.c
@@ -0,0 +1,38 @@
+#include <fenv.h>
+
+/* Dummy functions for archs lacking fenv implementation */
+
+int feclearexcept(int mask)
+{
+	return 0;
+}
+
+int feraiseexcept(int mask)
+{
+	return 0;
+}
+
+int fetestexcept(int mask)
+{
+	return 0;
+}
+
+int fegetround(void)
+{
+	return FE_TONEAREST;
+}
+
+int __fesetround(int r)
+{
+	return 0;
+}
+
+int fegetenv(fenv_t *envp)
+{
+	return 0;
+}
+
+int fesetenv(const fenv_t *envp)
+{
+	return 0;
+}