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

fusl/arch/powerpc/bits/fenv.h

Index: fusl/arch/powerpc/bits/fenv.h
diff --git a/fusl/arch/powerpc/bits/fenv.h b/fusl/arch/powerpc/bits/fenv.h
new file mode 100644
index 0000000000000000000000000000000000000000..2f722e6b594acc90f374e4d731aab7a23ead9a4a
--- /dev/null
+++ b/fusl/arch/powerpc/bits/fenv.h
@@ -0,0 +1,31 @@
+#define FE_TONEAREST	0
+#define FE_TOWARDZERO	1
+#define FE_UPWARD	2
+#define FE_DOWNWARD	3
+
+#define FE_INEXACT	0x02000000
+#define FE_DIVBYZERO	0x04000000
+#define FE_UNDERFLOW	0x08000000
+#define FE_OVERFLOW	0x10000000
+#define FE_INVALID	0x20000000
+
+#define FE_ALL_EXCEPT	0x3e000000
+
+#ifdef _GNU_SOURCE
+#define FE_INVALID_SNAN		0x01000000
+#define FE_INVALID_ISI		0x00800000
+#define FE_INVALID_IDI		0x00400000
+#define FE_INVALID_ZDZ		0x00200000
+#define FE_INVALID_IMZ		0x00100000
+#define FE_INVALID_COMPARE	0x00080000
+#define FE_INVALID_SOFTWARE	0x00000400
+#define FE_INVALID_SQRT		0x00000200
+#define FE_INVALID_INTEGER_CONVERSION	0x00000100
+
+#define FE_ALL_INVALID		0x01f80700
+#endif
+
+typedef unsigned fexcept_t;
+typedef double fenv_t;
+
+#define FE_DFL_ENV ((const fenv_t *)-1)