python-3.7.6: Use array for BOOST_VERSION

Store the variants of BOOST_VERSION in an array instead of in a space
seperated string to avoid parsing it over and over.

python-3.7.6-0.build.sh

@@ -242,15 +242,15 @@ pip3 install --prefix=$PREFIX multiqc
 #boost for pycuda
 (
 	. ${PREFIX}/profile
-	BOOST_VERSION="1.72.0 1_72_0"
-	BOOST_SRC=https://dl.bintray.com/boostorg/release/$( echo $BOOST_VERSION | cut -d" " -f1 )/source/boost_$( echo $BOOST_VERSION | cut -d" " -f2 ).tar.gz
+	BOOST_VERSION=(1.72.0 1_72_0)
+	BOOST_SRC=https://dl.bintray.com/boostorg/release/${BOOST_VERSION[0]}/source/boost_${BOOST_VERSION[1]}.tar.gz
 	PKGCFLAGS="-O2 -fPIC"
 
 	cd $BUILDDIR
-	test -e boost_$( echo $BOOST_VERSION | cut -d" " -f2 ).tar.gz || wget $BOOST_SRC
-	test -d boost-$( echo $BOOST_VERSION | cut -d" " -f1 ) || mkdir boost-$( echo $BOOST_VERSION | cut -d" " -f1 ) && tar -xf boost_$( echo $BOOST_VERSION | cut -d" " -f2 ).tar.gz -C boost-$( echo $BOOST_VERSION | cut -d" " -f1 ) --strip-components=1
+	test -e boost_${BOOST_VERSION[1]}.tar.gz || wget $BOOST_SRC
+	test -d boost-${BOOST_VERSION[0]} || mkdir boost-${BOOST_VERSION[0]} && tar -xf boost_${BOOST_VERSION[1]}.tar.gz -C boost-${BOOST_VERSION[0]} --strip-components=1
 
-	cd boost-$( echo $BOOST_VERSION | cut -d" " -f1 )
+	cd boost-${BOOST_VERSION[0]}
 	sed -e "/using python/ s|;|: ${PREFIX}/include/python${PYTHONVER}m ;|" \
       -i bootstrap.sh