build: simplify env.sh

Author: tiaga

scripts/env.sh

@@ -2,13 +2,22 @@
 
 set -e
 
-export ANDROID_NDK_HOME=/home/vm/Android/Sdk/ndk/25.2.9519653
-export ANDROID_NDK_ROOT=/home/vm/Android/Sdk/ndk/25.2.9519653
+if [ -z "$ANDROID_HOME" ]; then
+  if [ -d "$HOME/Android/Sdk" ]; then
+    export ANDROID_HOME="$HOME/Android/Sdk"
+  elif [ -d "$HOME/.local/lib/android/sdk" ]; then
+    export ANDROID_HOME="$HOME/.local/lib/android/sdk"
+  elif [ -d "$HOME/Library/Android/sdk" ]; then
+    export ANDROID_HOME="$HOME/Library/Android/sdk"
+  fi
+fi
+
+export ANDROID_NDK_HOME="$ANDROID_HOME/ndk/25.2.9519653"
 export NDK="$ANDROID_NDK_HOME"
 
-DEPS="$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin"
+DEPS=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin
 
-export ANDROID_ARM_CC="$DEPS/armv7a-linux-androideabi21-clang"
+export ANDROID_ARM_CC=$DEPS/armv7a-linux-androideabi21-clang
 export ANDROID_ARM_CXX=$DEPS/armv7a-linux-androideabi21-clang++
 export ANDROID_ARM_CC_21=$DEPS/armv7a-linux-androideabi21-clang
 export ANDROID_ARM_CXX_21=$DEPS/armv7a-linux-androideabi21-clang++