fixup! Base Browser's .mozconfigs.

BB 44067: Build geckodriver only on Linux.

After Bug 1908788, geckodriver has become a host tool.
So, even when we cross-compile, we get Linux binaries, and we stopped
shipping them in tor-browser-build.
Therefore, we can disable also their compilation.

browser/config/mozconfigs/base-browser

@@ -47,7 +47,4 @@ if test -z "$WASI_SYSROOT"; then
     ac_add_options --without-wasm-sandboxed-libraries
 fi
 
-# tor-browser#42337
-ac_add_options --enable-geckodriver
-
 ac_add_options --with-relative-data-dir=BaseBrowser/Data/Browser

mozconfig-linux-x86_64

@@ -11,3 +11,5 @@ ac_add_options --enable-default-toolkit=cairo-gtk3
 # Let's make sure no preference is enabling either Adobe's or Google's CDM.
 ac_add_options --disable-eme
 
+# tor-browser#44067: geckodriver has become a host-only tool
+ac_add_options --enable-geckodriver