configure.in: fix for clang 5.1 __builtin_longjmp
void**
jmp_buf
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45508 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: fix for clang 5.1 __builtin_longjmp
clang 5.1 uses
void**
, notjmp_buf
. [Bug #9692]git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45508 b2dd03c8-39d4-4d8f-98ff-823fe69b080e