Revert "OSX: Fix FFMPEG Xcode15 linker issue"

This was specifically an Xcode 15.0 linker issue and not directly
related to clang.  The problem is fixed in Xcode 15.1.  Affected users
should update their version of Xcode.

The patch is being reverted as it causes some issues with non-xcode
compiles.

This reverts commit 26b4a11.

mythtv/external/FFmpeg/configure

@@ -5546,8 +5546,6 @@ case $target_os in
         if enabled clang; then
             clang_version=$($cc -dumpversion)
             test ${clang_version%%.*} -eq 11 && add_cflags -fno-stack-check
-            # Workaround code for Xcode >= 15
-            test ${clang_version%%.*} -ge 15 && add_ldflags -ld_classic
         fi
         ;;
     msys*)