Travis: add a build with no-stdio

Reviewed-by: NRich Salz <rsalz@openssl.org>

.travis.yml

@@ -30,6 +30,7 @@ env:
     - CONFIG_OPTS="--debug no-shared enable-crypto-mdebug enable-rc5 enable-md2"
     - CONFIG_OPTS="no-pic --strict-warnings" BUILDONLY="yes"
     - CONFIG_OPTS="no-engine no-shared --strict-warnings" BUILDONLY="yes"
+    - CONFIG_OPTS="no-stdio --strict-warnings" BUILDONLY="yes"
 
 matrix:
     include:
@@ -48,15 +49,24 @@ matrix:
         - os: linux
           compiler: clang-3.6
           env: CONFIG_OPTS="no-shared no-asm enable-asan enable-rc5 enable-md2"
+        - os: linux
+          compiler: clang-3.6
+          env: CONFIG_OPTS="no-stdio"
         - os: linux
           compiler: gcc-5
           env: CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 -DPEDANTIC"
         - os: linux
           compiler: i686-w64-mingw32-gcc
           env: CONFIG_OPTS="no-pic"
+        - os: linux
+          compiler: i686-w64-mingw32-gcc
+          env: CONFIG_OPTS="no-stdio"
         - os: linux
           compiler: x86_64-w64-mingw32-gcc
           env: CONFIG_OPTS="no-pic"
+        - os: linux
+          compiler: x86_64-w64-mingw32-gcc
+          env: CONFIG_OPTS="no-stdio"
     exclude:
         - os: linux
           compiler: clang