tools/bison: update to 3.8.1

Remove upstreamed patch.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

tools/bison/Makefile

@@ -7,11 +7,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=bison
-PKG_VERSION:=3.7.6
+PKG_VERSION:=3.8.1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
-PKG_HASH:=67d68ce1e22192050525643fc0a7a22297576682bef6a5c51446903f5aeef3cf
+PKG_HASH:=31fc602488aad6bdecf0ccc556e0fc72fc57cdc595cf92398f020e0cf4980f15
 
 HOST_BUILD_PARALLEL:=1
 

tools/bison/patches/100-fix-gets-removal.patch

---- a/lib/stdio.in.h
-+++ b/lib/stdio.in.h
-@@ -835,14 +835,6 @@ _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 && !defined __cplusplus
--_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
--#endif
--
- #if defined _WIN32 && !defined __CYGWIN__
- # undef getw
- # define getw _getw