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

fusl/arch/arm/bits/user.h

Index: fusl/arch/arm/bits/user.h
diff --git a/fusl/arch/arm/bits/user.h b/fusl/arch/arm/bits/user.h
new file mode 100644
index 0000000000000000000000000000000000000000..3e5a4d21dc4de053b54efb2347a1e03d7591f493
--- /dev/null
+++ b/fusl/arch/arm/bits/user.h
@@ -0,0 +1,36 @@
+typedef struct user_fpregs {
+	struct fp_reg {
+		unsigned sign1:1;
+		unsigned unused:15;
+		unsigned sign2:1;
+		unsigned exponent:14;
+		unsigned j:1;
+		unsigned mantissa1:31;
+		unsigned mantissa0:32;
+	} fpregs[8];
+	unsigned fpsr:32;
+	unsigned fpcr:32;
+	unsigned char ftype[8];
+	unsigned int init_flag;
+} elf_fpregset_t;
+
+struct user_regs {
+	unsigned long uregs[18];
+};
+#define ELF_NGREG 18
+typedef unsigned long elf_greg_t, elf_gregset_t[ELF_NGREG];
+
+struct user {
+	struct user_regs regs;
+	int u_fpvalid;
+	unsigned long u_tsize, u_dsize, u_ssize;
+	unsigned long start_code, start_stack;
+	long signal;
+	int reserved;
+	struct user_regs *u_ar0;
+	unsigned long magic;
+	char u_comm[32];
+	int u_debugreg[8];
+	struct user_fpregs u_fp;
+	struct user_fpregs *u_fp0;
+};