build: install into install-files not install which clashes with case-insensitive INSTALL file on win32

build_arm_2.sh

@@ -0,0 +1,23 @@
+#export TOOLCHAIN=/opt/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64
+export TOOLCHAIN=/c/Users/david/AppData/Local/Android/Sdk/ndk/29.0.14206865/toolchains/llvm/prebuilt/windows-x86_64
+export TARGET=aarch64-linux-android
+#export TARGET=x86_64-linux-android
+export API=24
+export AR=$TOOLCHAIN/bin/llvm-ar
+export AS=$TOOLCHAIN/bin/llvm-as
+export CC=$TOOLCHAIN/bin/$TARGET$API-clang
+export CXX=$TOOLCHAIN/bin/$TARGET$API-clang++
+export LD=$TOOLCHAIN/bin/ld
+export RANLIB=$TOOLCHAIN/bin/llvm-ranlib
+export STRIP=$TOOLCHAIN/bin/llvm-strip
+
+export CFLAGS=-DNOXFERMEM
+./configure --host $TARGET --with-audio=dummy --with-cpu=arm_fpu --prefix=$(pwd)/install-files
+make
+make install
+
+# add NOXFERMEM ifdefs to buffer.c and xfermem.c
+# see https://android.googlesource.com/platform/external/mpg123/+/refs/heads/master/src/buffer.c
+#
+
+# run 'make' with MSYS2, not Chocolatey make -> avoid 'C:/Program Files/' style SHELL