ld: unknown option: -export_dynamic

[ryandesign]

Describe the bug
Some software building with meson now fails to build on Mac OS X 10.6 and earlier because meson now uses the linker flag -export_dynamic which the linker on Mac OS X 10.6 and earlier does not understand. See https://trac.macports.org/ticket/70386 and https://trac.macports.org/ticket/70496. This is a regression. This was caused by #13291 to fix #13290. The addition of this flag is suspect to me since all software that has ever built using meson on Mac OS X 10.6 prior to this change did so successfully without this flag. We are now reverting this change in MacPorts on Mac OS X 10.6 and earlier. Cc @barracuda156

To Reproduce
Build e.g. glib2 with meson on Mac OS X 10.6.

Expected behavior
Successful build

system parameters

• Is this a cross build or just a plain native build (for the same computer)? plain native build
• what operating system (e.g. MacOS Catalina, Windows 10, CentOS 8.0, Ubuntu 18.04, etc.): Mac OS X 10.6
• what Python version are you using e.g. 3.8.0: 3.12.5
• what meson --version: 1.5.1
• what ninja --version if it's a Ninja build: 1.12.1

[thesamesam]

cc @wolfgangwalther

[wolfgangwalther]

cc @wolfgangwalther

See #13557.