FIN: switch appveryor to mingw with posix threads

appveyor.yml

@@ -35,13 +35,13 @@ environment:
     RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-ninja
     SCRIPT: python x.py test
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror
-    MINGW_ARCHIVE: i686-6.2.0-release-win32-dwarf-rt_v5-rev1.7z
+    MINGW_ARCHIVE: i686-6.2.0-release-posix-dwarf-rt_v5-rev1.7z
     MINGW_DIR: mingw32
   - MSYS_BITS: 64
     SCRIPT: python x.py test
     RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-ninja
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror
-    MINGW_ARCHIVE: x86_64-6.2.0-release-win32-seh-rt_v5-rev1.7z
+    MINGW_ARCHIVE: x86_64-6.2.0-release-posix-seh-rt_v5-rev1.7z
     MINGW_DIR: mingw64
 
   # 32/64 bit MSVC and GNU deployment
@@ -60,14 +60,14 @@ environment:
     RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-extended --enable-ninja
     SCRIPT: python x.py dist
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror
-    MINGW_ARCHIVE: i686-6.2.0-release-win32-dwarf-rt_v5-rev1.7z
+    MINGW_ARCHIVE: i686-6.2.0-release-posix-dwarf-rt_v5-rev1.7z
     MINGW_DIR: mingw32
     DEPLOY: 1
   - MSYS_BITS: 64
     SCRIPT: python x.py dist
     RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-extended --enable-ninja
     MINGW_URL: https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror
-    MINGW_ARCHIVE: x86_64-6.2.0-release-win32-seh-rt_v5-rev1.7z
+    MINGW_ARCHIVE: x86_64-6.2.0-release-posix-seh-rt_v5-rev1.7z
     MINGW_DIR: mingw64
     DEPLOY: 1