This removes -Wno-narrowing from warnings.m4.
This is PR build/23087.
gdb/ChangeLog
2018-08-27  Tom Tromey  <tom@tromey.com>
	PR build/23087:
	* configure: Rebuild.
	* warning.m4 (AM_GDB_WARNINGS): Remove -Wno-narrowing.
gdb/gdbserver/ChangeLog
2018-08-27  Tom Tromey  <tom@tromey.com>
	PR build/23087:
	* configure: Rebuild.
+2018-08-27  Tom Tromey  <tom@tromey.com>
+
+       PR build/23087:
+       * configure: Rebuild.
+       * warning.m4 (AM_GDB_WARNINGS): Remove -Wno-narrowing.
+
 2018-08-27  Tom Tromey  <tom@tromey.com>
 
        * aarch64-linux-tdep.c
 
 -Wno-unused -Wunused-value -Wunused-variable -Wunused-function \
 -Wno-switch -Wno-char-subscripts \
 -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \
--Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized \
+-Wno-sign-compare -Wno-error=maybe-uninitialized \
 -Wno-mismatched-tags \
 -Wno-error=deprecated-register \
 -Wsuggest-override \
 
+2018-08-27  Tom Tromey  <tom@tromey.com>
+
+       PR build/23087:
+       * configure: Rebuild.
+
 2018-08-27  Tom Tromey  <tom@tromey.com>
 
        * linux-s390-low.c (s390_emit_ext, s390_emit_litpool)
 
 -Wno-unused -Wunused-value -Wunused-variable -Wunused-function \
 -Wno-switch -Wno-char-subscripts \
 -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \
--Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized \
+-Wno-sign-compare -Wno-error=maybe-uninitialized \
 -Wno-mismatched-tags \
 -Wno-error=deprecated-register \
 -Wsuggest-override \
 
 -Wno-unused -Wunused-value -Wunused-variable -Wunused-function \
 -Wno-switch -Wno-char-subscripts \
 -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \
--Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized \
+-Wno-sign-compare -Wno-error=maybe-uninitialized \
 -Wno-mismatched-tags \
 -Wno-error=deprecated-register \
 -Wsuggest-override \