Remove greedy wildcards from libstdc++ linker script

The only symbols matched by std::e[a-q]* and std::e[s-z]* that are
supposed to be in the GLIBCXX_3.4 version are std::exception::* and
std::endl and std::ends. The latter two already have explicit patterns
matching them, so we just need to match std::exception::*.

This change ensures that any new symbols with a return type of
std::enable_if<...> are not added to the GLIBCXX_3.4 version.

	* config/abi/pre/gnu.ver: Tighten up greedy wildcards.

From-SVN: r276468

libstdc++-v3/ChangeLog

 2019-10-02  Jonathan Wakely  <jwakely@redhat.com>
 
+	* config/abi/pre/gnu.ver: Tighten up greedy wildcards.
+
 	* doc/xml/manual/parallel_mode.xml: Add caveat about support for
 	recent standards.
 	* doc/html/*: Regenerate.

libstdc++-v3/config/abi/pre/gnu.ver

@@ -80,9 +80,8 @@ GLIBCXX_3.4 {
 #     std::domain_error::d*;
 #     std::domain_error::~d*;
       std::d[p-z]*;
-      std::e[a-q]*;
       std::error[^_]*;
-      std::e[s-z]*;
+      std::exception::*;
       std::gslice*;
       std::h[^a]*;
       std::i[a-m]*;