configure.in: limit to "T" type for prefix of external symbols because x86_64-w64-mingw32-gcc on Debian GNU/Linux generates the following symbol: 0000000068483390 D _GLOBAL__F__conftest_external
Approved by nobu.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31531 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: limit to "T" type for prefix of external symbols
because x86_64-w64-mingw32-gcc on Debian GNU/Linux generates the
following symbol:
0000000068483390 D _GLOBAL__F__conftest_external
Approved by nobu.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31531 b2dd03c8-39d4-4d8f-98ff-823fe69b080e