Revert "Set host_arch to ia32 on machines with a 32bit userland but a 64bit kernel."

build/standalone.gypi

Index: build/standalone.gypi
diff --git a/build/standalone.gypi b/build/standalone.gypi
index 7952bdca90dd28bc83dc71a8d617745a9b55944f..7670e5bead5793efd6ef9fa7480fb2a619cd86d0 100644
--- a/build/standalone.gypi
+++ b/build/standalone.gypi
@@ -51,7 +51,13 @@
               # Anything else gets passed through, which probably won't work
               # very well; such hosts should pass an explicit target_arch
               # to gyp.
-              'host_arch%': '<!pymod_do_main(detect_v8_host_arch)',
+              'host_arch%':
+                '<!(uname -m | sed -e "s/i.86/ia32/;\
+                                       s/x86_64/x64/;\
+                                       s/amd64/x64/;\
+                                       s/arm.*/arm/;\
+                                       s/aarch64/arm64/;\
+                                       s/mips.*/mipsel/")',
             }, {
               # OS!="linux" and OS!="freebsd" and OS!="openbsd" and
               # OS!="netbsd" and OS!="mac"