OPENDINGUX: Rework build_odbeta.sh to avoid environment variables

backends/platform/sdl/opendingux/README.BUILD

@@ -6,12 +6,12 @@ Running Linux on an x86/amd64 machine:
 
 2. git clone the ScummVM repository
 
-3. Run 'target=x backends/platform/sdl/opendingux/build_odbeta.sh' 
+3. Run 'backends/platform/sdl/opendingux/build_odbeta.sh x'
    where x=gcw0|lepus|rg99 
 
    Or if you want a dual opk with one launcher capable of starting games directly 
    for e.g. simplemenu integration :
-   'target=x dualopk=yes backends/platform/sdl/opendingux/build_odbeta.s' 
+   'backends/platform/sdl/opendingux/build_odbeta.sh x dualopk'
 
 4. Copy the resulting file scummvm_$(target).opk or scummvm_$(target)_dual.opk to your device
 

backends/platform/sdl/opendingux/build_odbeta.sh

@@ -1,37 +1,46 @@
 #!/bin/bash
 
-CONFIG="./configure --host=opendingux-$target --enable-release --disable-detection-full"
+set -e
+
+target=$1
+if [ "$2" = "dualopk" ]; then
+	dualopk="dualopk=yes"
+else
+	dualopk=
+fi
 
 case $target in
 
         gcw0)
 	target2=$target
+	libc=uclibc
         ;;
 
         lepus)
 	target2=$target
+	libc=musl
         ;;
 
         rg99)
 	target2=rs90
+	libc=musl
         ;;
         
         *)
         echo "please provide a valid target for the build: gcw0, lepus or rg99"
-        exit 0
+        exit 1
         ;;
 esac
 
 TOOLCHAIN=/opt/$target2-toolchain
-
-if [ $target == "gcw0" ]; then
-	SYSROOT=$TOOLCHAIN/mipsel-$target2-linux-uclibc
-else
-	SYSROOT=$TOOLCHAIN/mipsel-$target2-linux-musl
-fi
+SYSROOT=$TOOLCHAIN/mipsel-$target2-linux-$libc
 
 export PATH=$TOOLCHAIN/usr/bin:$SYSROOT/usr/include:$TOOLCHAIN/bin:$PATH
 export CXX=mipsel-linux-g++
 export CXXFLAGS="-funsigned-char" # workaround for a scummvm tolower() bug when adding games
 
-$CONFIG && make -j12 od-make-opk && ls -lh scummvm_$target*.opk
+./configure --host=opendingux-$target --enable-release --disable-detection-full
+
+make -j12 od-make-opk $dualopk
+
+ls -lh scummvm_$target*.opk