[source] tools/m4: update 1.4.18

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/d90abebd06bbb004fc7957c39fe89202fbdca9f2

commit d90abebd06bbb004fc7957c39fe89202fbdca9f2
Author: Etienne Haarsma <bladeoner112 at gmail.com>
AuthorDate: Sun Feb 12 16:50:07 2017 +0100

    tools/m4: update 1.4.18
    
    Patch 100-fix-gets-removal.patch is removed because it's included in the new version.
    
    Signed-off-by: Etienne Haarsma <bladeoner112 at gmail.com>
---
 tools/m4/Makefile                           |  4 ++--
 tools/m4/patches/100-fix-gets-removal.patch | 17 -----------------
 2 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/tools/m4/Makefile b/tools/m4/Makefile
index 6fe9e0b..aa3c382 100644
--- a/tools/m4/Makefile
+++ b/tools/m4/Makefile
@@ -7,11 +7,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=m4
-PKG_VERSION:=1.4.17
+PKG_VERSION:=1.4.18
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
-PKG_HASH:=f0543c3beb51fa6b3337d8025331591e0e18d8ec2886ed391f1aade43477d508
+PKG_HASH:=f2c1e86ca0a404ff281631bdc8377638992744b175afb806e25871a24a934e07
 PKG_CAT:=xzcat
 
 HOST_BUILD_PARALLEL:=1
diff --git a/tools/m4/patches/100-fix-gets-removal.patch b/tools/m4/patches/100-fix-gets-removal.patch
deleted file mode 100644
index ecd110d..0000000
--- a/tools/m4/patches/100-fix-gets-removal.patch
+++ /dev/null
@@ -1,17 +0,0 @@
---- a/lib/stdio.in.h
-+++ b/lib/stdio.in.h
-@@ -714,14 +714,6 @@ _GL_WARN_ON_USE (getline, "getline is un
- # endif
- #endif
- 
--/* It is very rare that the developer ever has full control of stdin,
--   so any use of gets warrants an unconditional warning; besides, C11
--   removed it.  */
--#undef gets
--#if HAVE_RAW_DECL_GETS
--_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
--#endif
--
- 
- #if @GNULIB_OBSTACK_PRINTF@ || @GNULIB_OBSTACK_PRINTF_POSIX@
- struct obstack;