Auto merge of #38419 - alexcrichton:travis-osx-32-bit, r=brson

travis: Fix testing 32-bit OSX target

We passed --target when we meant to pass --build, meaning we tested only the
standard library for 32-bit, not the whole compiler like we intended.

.travis.yml

@@ -27,7 +27,7 @@ matrix:
     # OSX builders
     - env: >
         RUST_CHECK_TARGET=check
-        RUST_CONFIGURE_ARGS=--target=x86_64-apple-darwin
+        RUST_CONFIGURE_ARGS=--build=x86_64-apple-darwin
         SRC=.
       os: osx
       install: &osx_install_sccache >
@@ -35,13 +35,13 @@ matrix:
           tar xJf - -C /usr/local/bin --strip-components=1
     - env: >
         RUST_CHECK_TARGET=check
-        RUST_CONFIGURE_ARGS=--target=i686-apple-darwin
+        RUST_CONFIGURE_ARGS=--build=i686-apple-darwin
         SRC=.
       os: osx
       install: *osx_install_sccache
     - env: >
         RUST_CHECK_TARGET=check
-        RUST_CONFIGURE_ARGS=--target=x86_64-apple-darwin --disable-rustbuild
+        RUST_CONFIGURE_ARGS=--build=x86_64-apple-darwin --disable-rustbuild
         SRC=.
       os: osx
       install: *osx_install_sccache