Don't use --enable-rust-simd, fails to build.

Don't use --disable-zucchini, not a supported flag on OpenBSD.

Remove $WASI_SYSROOT test, it breaks the build for us. Not sure if the test
is relevant for us. Was added upstream in
https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/41406

Index: browser/config/mozconfigs/base-browser
--- browser/config/mozconfigs/base-browser.orig
+++ browser/config/mozconfigs/base-browser
@@ -11,18 +11,16 @@ mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/obj-@CONFIG_GUES
 export MOZILLA_OFFICIAL=1
 
 ac_add_options --enable-optimize
-ac_add_options --enable-rust-simd
 
 ac_add_options --disable-unverified-updates
 ac_add_options --enable-base-browser-update
-# tor-browser#44414: Disable Zucchini until we fix mingw compatibility and work
-# on potential updates for our update pipeline.
-ac_add_options --disable-zucchini
 
 ac_add_options --enable-bundled-fonts
 
 ac_add_options --disable-tests
 ac_add_options --disable-debug
+# avoid 1.1GB libxul
+ac_add_options --disable-debug-symbols
 
 ac_add_options --disable-crashreporter
 # Before removing, please notice that WebRTC does not work on mingw (Bug 1393901)
@@ -44,7 +42,3 @@ ac_add_options MOZ_TELEMETRY_REPORTING=
 # Disable the creation of a <something>.default that Firefox by default creates
 # for old version that could not use dedicated profiles. See tor-browser#41542.
 ac_add_options --disable-legacy-profile-creation
-
-if test -z "$WASI_SYSROOT"; then
-    ac_add_options --without-wasm-sandboxed-libraries
-fi
