clean garbage in minimp3

thirdparty/minimp3/.gitignore

@@ -1,7 +0,0 @@
-fate-suite.ffmpeg.org
-player/SDL
-minimp3
-minimp3_arm
-*.gcda
-*.gcno
-*.gcov

thirdparty/minimp3/.travis.yml

@@ -1,34 +0,0 @@
-dist: bionic
-language: c
-addons:
-  apt:
-    packages:
-      - build-essential
-      - libc6-dev-i386
-      - linux-libc-dev:i386
-      - gcc-arm-none-eabi
-      - libnewlib-arm-none-eabi
-      - gcc-7-multilib
-      - gcc-7-aarch64-linux-gnu
-      - gcc-7-powerpc-linux-gnu
-      - gcc-aarch64-linux-gnu
-      - gcc-powerpc-linux-gnu
-      - libc6-arm64-cross
-      - libc6-powerpc-cross
-      - libc6-dev-arm64-cross
-      - libc6-dev-powerpc-cross
-      - qemu
-      - lcov
-
-os:
-    - linux
-
-compiler:
-    - gcc
-
-script:
-    - scripts/build.sh
-    - (pushd player/; ./build.sh linux; popd)
-
-after_success:
-    - bash <(curl -s https://codecov.io/bash)