gas: fold three as_warn() in emit_expr_with_reloc()

Simply use the available abstraction instead of, effectively, trying to
open-code it.
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 493fde0..ecd0794 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,9 @@
 2021-06-14  Jan Beulich  <jbeulich@suse.com>
 
+	* read.c (emit_expr_with_reloc): Fold three as_warn().
+
+2021-06-14  Jan Beulich  <jbeulich@suse.com>
+
 	* doc/internals.texi (TC_ADDRESS_BYTES): Mention generic default.
 	* read.c (potable, cons_worker): Drop TC_ADDRESS_BYTES
 	conditional.
diff --git a/gas/read.c b/gas/read.c
index 380281d..2f93e1b 100644
--- a/gas/read.c
+++ b/gas/read.c
@@ -4539,18 +4539,8 @@
 	      || (get & hibit) == 0))
 	{
 	  /* Leading bits contain both 0s & 1s.  */
-#if defined (BFD64) && BFD_HOST_64BIT_LONG_LONG
-#ifndef __MSVCRT__
-	  as_warn (_("value 0x%llx truncated to 0x%llx"),
-		   (unsigned long long) get, (unsigned long long) use);
-#else
-	  as_warn (_("value 0x%I64x truncated to 0x%I64x"),
-		   (unsigned long long) get, (unsigned long long) use);
-#endif
-#else
-	  as_warn (_("value 0x%lx truncated to 0x%lx"),
-		   (unsigned long) get, (unsigned long) use);
-#endif
+	  as_warn (_("value 0x%" BFD_VMA_FMT "x truncated to 0x%" BFD_VMA_FMT "x"),
+		   get, use);
 	}
       /* Put bytes in right order.  */
       md_number_to_chars (p, use, (int) nbytes);