fix(build): set target_arch to fix NSS build on Apple Silicon

GYP expects the `target_arch` environment variable to determine the correct
architecture when building NSS. On Apple Silicon, if this is unset or misconfigured,
NSS can be built for `x86_64`, leading to linker failures due to architecture mismatch.

This patch sets `target_arch` based on `uname -m` when building on macOS,
ensuring correct architecture selection and avoiding these build errors.

Author: groovecoder

libs/build-nss-desktop.sh

@@ -33,12 +33,15 @@ elif [[ -n "${CROSS_COMPILE_TARGET}" ]]; then
 elif [[ "$(uname -s)" == "Darwin" ]]; then
   TARGET_OS="macos"
   # We need to set this variable for switching libs based on different macos archs (M1 vs Intel)
+  # Also set lowercase target_arch which gyp expects
   if [[ "$(uname -m)" == "arm64" ]]; then
     DIST_DIR=$(abspath "desktop/darwin-aarch64/nss")
     TARGET_ARCH="aarch64"
+    target_arch="$(uname -m)"
   else
     DIST_DIR=$(abspath "desktop/darwin-x86-64/nss")
     TARGET_ARCH="x86_64"
+    target_arch="$(uname -m)"
   fi
 elif [[ "$(uname -s)" == "Linux" ]]; then
   # This is a JNA weirdness: "x86-64" rather than "x86_64".