external: import cpu_features library

Taken from https://github.com/google/cpu_features at revision
26133d3b620c2c27f31d571efd27371100f891e9

external/cpu_features/.travis.yml

@@ -0,0 +1,91 @@
+language: c
+
+sudo: false
+
+cache:
+  directories:
+    - $HOME/cpu_features_archives
+
+matrix:
+  include:
+  - os: linux
+    compiler: gcc
+    env:
+      TOOLCHAIN=NATIVE
+      TARGET=native
+  - os: linux
+    compiler: clang
+    env:
+      TOOLCHAIN=NATIVE
+      TARGET=native
+  - os: osx
+    compiler: gcc
+    env:
+      TOOLCHAIN=NATIVE
+      TARGET=native
+  - os: osx
+    compiler: clang
+    env:
+      TOOLCHAIN=NATIVE
+      TARGET=native
+  - os: linux-ppc64le
+    compiler: gcc
+    env:
+      TOOLCHAIN=NATIVE
+      TARGET=native
+  - os: linux-ppc64le
+    compiler: clang
+    env:
+      TOOLCHAIN=NATIVE
+      TARGET=native
+  # Toolchains for little-endian, 64-bit ARMv8 for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=aarch64-linux-gnu
+      QEMU_ARCH=aarch64
+  # Toolchains for little-endian, hard-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=arm-linux-gnueabihf
+      QEMU_ARCH=arm
+  # Toolchains for little-endian, 32-bit ARMv8 for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=armv8l-linux-gnueabihf
+      QEMU_ARCH=arm
+  # Toolchains for little-endian, soft-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=arm-linux-gnueabi
+      QEMU_ARCH=arm
+  # Toolchains for big-endian, 64-bit ARMv8 for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=aarch64_be-linux-gnu
+      QEMU_ARCH=DISABLED
+  # Toolchains for big-endian, hard-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=armeb-linux-gnueabihf
+      QEMU_ARCH=DISABLED
+  # Toolchains for big-endian, soft-float, 32-bit ARMv7 (and earlier) for GNU/Linux systems
+  - os: linux
+    env:
+      TOOLCHAIN=LINARO
+      TARGET=armeb-linux-gnueabi
+      QEMU_ARCH=DISABLED
+  - os: linux
+    env:
+      TOOLCHAIN=CODESCAPE
+      TARGET=mips-mti-linux-gnu
+      QEMU_ARCH=DISABLED
+
+script:
+  - cmake --version
+  - bash -e -x ./scripts/run_integration.sh