Use -export-dynamic only when linking an httpd which includes mod_so,

Use -export-dynamic only when linking an httpd which includes mod_so,
not when linking modules or support programs.

* modules/aaa/config.m4, modules/arch/win32/config.m4,
modules/cache/config.m4, modules/echo/config.m4,
modules/filters/config.m4, modules/generators/config5.m4,
modules/metadata/config.m4: Don't add -export-dynamic to LT_LDFLAGS.

* modules/mappers/config9.m4: Add -export-dynamic to HTTPD_LDFLAGS
when mod_so is enabled.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102235 13f79535-47bb-0310-9956-ffa450edef68