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

fusl/arch/sh/bits/fenv.h

Index: fusl/arch/sh/bits/fenv.h
diff --git a/fusl/arch/sh/bits/fenv.h b/fusl/arch/sh/bits/fenv.h
new file mode 100644
index 0000000000000000000000000000000000000000..7f1b8b66c6d1a9d3f7fb0c522a17453b0e98468b
--- /dev/null
+++ b/fusl/arch/sh/bits/fenv.h
@@ -0,0 +1,26 @@
+#ifndef __SH_FPU_ANY__
+
+#define FE_ALL_EXCEPT 0
+#define FE_TONEAREST  0
+
+#else
+
+#define FE_TONEAREST  0
+#define FE_TOWARDZERO 1
+
+#define FE_INEXACT    0x04
+#define FE_UNDERFLOW  0x08
+#define FE_OVERFLOW   0x10
+#define FE_DIVBYZERO  0x20
+#define FE_INVALID    0x40
+#define FE_ALL_EXCEPT 0x7c
+
+#endif
+
+typedef unsigned long fexcept_t;
+
+typedef struct {
+	unsigned long __cw;
+} fenv_t;
+
+#define FE_DFL_ENV    ((const fenv_t *) -1)