add patch fixing sh sibcall bug that affected musl, remove workaround

Makefile

@@ -143,7 +143,6 @@ musl/.mcm_cloned:
 
 musl/.mcm_configured: musl/.mcm_cloned gcc-$(GCC_VER)/build0/.mcm_built
 	cd musl && ./configure $(MUSL_CONFIG)
-	cat patches/musl-complex-hack >> musl/config.mak
 	touch $@
 
 musl/.mcm_built: musl/.mcm_configured

patches/gcc-5.2.0/0008-shsibcall.diff

@@ -0,0 +1,39 @@
+--- a/gcc/config/sh/sh.md (revision 233324)
++++ b/gcc/config/sh/sh.md (working copy)
+@@ -10476,7 +10476,7 @@
+        (call (mem:SI (match_operand:SI 1 "symbol_ref_operand" ""))
+              (match_operand 2 "" "")))
+    (use (reg:SI FPSCR_MODES_REG))
+-   (clobber (match_scratch:SI 3 "=k"))
++   (clobber (reg:SI R1_REG))
+    (return)]
+   "TARGET_SH2 && !TARGET_FDPIC"
+   "#"
+@@ -10491,6 +10495,8 @@
+   rtx lab = PATTERN (gen_call_site ());
+   rtx call_insn;
+
++  operands[3] =  gen_rtx_REG (SImode, R1_REG);
++
+   sh_expand_sym_label2reg (operands[3], operands[1], lab, true);
+   call_insn = emit_call_insn (gen_sibcall_valuei_pcrel (operands[0],
+                                                        operands[3],
+@@ -10511,7 +10519,7 @@
+              (match_operand 2)))
+    (use (reg:SI FPSCR_MODES_REG))
+    (use (reg:SI PIC_REG))
+-   (clobber (match_scratch:SI 3 "=k"))
++   (clobber (reg:SI R1_REG))
+    (return)]
+   "TARGET_SH2 && TARGET_FDPIC"
+   "#"
+@@ -10520,6 +10528,8 @@
+ {
+   rtx lab = PATTERN (gen_call_site ());
+
++  operands[3] =  gen_rtx_REG (SImode, R1_REG);
++
+   sh_expand_sym_label2reg (operands[3], operands[1], lab, true);
+   rtx i = emit_call_insn (gen_sibcall_valuei_pcrel_fdpic (operands[0],
+                                                          operands[3],
+

patches/musl-complex-hack

@@ -1,2 +0,0 @@
-$(patsubst %.c,%.o,$(wildcard src/complex/*.c)): CFLAGS += -fno-optimize-sibling-calls
-$(patsubst %.c,%.lo,$(wildcard src/complex/*.c)): CFLAGS += -fno-optimize-sibling-calls