Remove strip_underscore from struct emulation

This field is unused.  I would have liked to also remove
leading_underscore and fake_label_name but in an i386-elf/coff/aout
multi-obj setup those fields are used to select a different
fake_label_name for aout.

	* emul.h (struct emulation): Delete strip_underscore.
	* emul-target.h (emul_strip_underscore): Don't define.
	(emul_struct_name): Update initialization.

Author: amodra

gas/ChangeLog

@@ -1,3 +1,9 @@
+2019-03-21  Alan Modra  <amodra@gmail.com>
+
+	* emul.h (struct emulation): Delete strip_underscore.
+	* emul-target.h (emul_strip_underscore): Don't define.
+	(emul_struct_name): Update initialization.
+
 2019-03-21  Alan Modra  <amodra@gmail.com>
 
 	* config/tc-d10v.c (md_apply_fix): Apply BFD_RELOC_8.

gas/emul-target.h

@@ -38,10 +38,6 @@
 #define emul_leading_underscore		2
 #endif
 
-#ifndef emul_strip_underscore
-#define emul_strip_underscore		0
-#endif
-
 #ifndef emul_default_endian
 #define emul_default_endian		2
 #endif
@@ -57,7 +53,7 @@ struct emulation emul_struct_name =
     emul_init,
     emul_bfd_name,
     emul_local_labels_fb, emul_local_labels_dollar,
-    emul_leading_underscore, emul_strip_underscore,
+    emul_leading_underscore,
     emul_default_endian,
     emul_fake_label_name,
     emul_format,

gas/emul.h

@@ -30,7 +30,6 @@ struct emulation
     unsigned                  local_labels_fb : 1;
     unsigned                  local_labels_dollar : 1;
     unsigned                  leading_underscore : 2;
-    unsigned                  strip_underscore : 1;
     unsigned                  default_endian : 2;
     const char *              fake_label_name;
     const struct format_ops * format;