Refactor PROLOGUE macro in asm.m4.

ChangeLog

 2015-01-12  Niels Möller  <nisse@lysator.liu.se>
 
+	* asm.m4 (DECLARE_FUNC): New macro, extracted from PROLOGUE.
+	(PROLOGUE): Use it.
+
 	* configure.ac (OPT_NETTLE_OBJS, OPT_HOGWEED_OBJS): Renamed
 	substituted variables, and list the object files rather than
 	source files.

asm.m4

@@ -13,21 +13,20 @@ dnl Including files from the srcdir
 define(<include_src>, <include(srcdir/$1)>)dnl
 
 dnl Pseudo ops
-
-define(<PROLOGUE>,
+define(<DECLARE_FUNC>,
 <ifelse(ELF_STYLE,yes,
-<.globl C_NAME($1)
-.type C_NAME($1),TYPE_FUNCTION
-C_NAME($1):>,
-COFF_STYLE, <yes>,
-<.globl C_NAME($1)
-.def C_NAME($1)
+<.type $1,TYPE_FUNCTION>,
+COFF_STYLE, yes,
+<.def $1
 .scl 2
 .type 32
-.endef
-C_NAME($1):>,
+.endef>,
+<>)>)
+
+define(<PROLOGUE>,
 <.globl C_NAME($1)
-C_NAME($1):>)>)
+DECLARE_FUNC(C_NAME($1))
+C_NAME($1):>)
 
 define(<EPILOGUE>,
 <ifelse(ELF_STYLE,yes,