ixion: switch SOURCE_URI to tar.xz and https. (#3101)

Also add quotes here and there to make sure the recipe will still
be OK if/when "haikuporter --nochroot" is implemented.

dev-libs/ixion/ixion-0.14.0.recipe

@@ -10,9 +10,9 @@ and a partial calculation of only the affected cells need to be calculated."
 HOMEPAGE="https://gitlab.com/ixion/ixion"
 COPYRIGHT="Kohei Yoshida et al."
 LICENSE="MPL v2.0"
-REVISION="2"
-SOURCE_URI="http://kohei.us/files/ixion/src/libixion-$portVersion.tar.gz"
-CHECKSUM_SHA256="5f646dd5089700093be157ff71698e276df9512afb4806954094a936f80ca9d1"
+REVISION="3"
+SOURCE_URI="https://kohei.us/files/ixion/src/libixion-$portVersion.tar.xz"
+CHECKSUM_SHA256="5805d49bb110e53eeb4224cdbcbcdba91928315dcb5672af8f90942ad34afe5e"
 SOURCE_DIR="libixion-$portVersion"
 PATCHES="ixion-$portVersion.patchset"
 
@@ -66,10 +66,10 @@ BUILD_PREREQUIRES="
 	"
 
 defineDebugInfoPackage ixion$secondaryArchSuffix \
-	$binDir/ixion-formula-tokenizer \
-	$binDir/ixion-parser \
-	$binDir/ixion-sorter \
-	$libDir/libixion-$soVersion.so.0.0.0
+	"$binDir"/ixion-formula-tokenizer \
+	"$binDir"/ixion-parser \
+	"$binDir"/ixion-sorter \
+	"$libDir"/libixion-$soVersion.so.0.0.0
 
 PATCH()
 {
@@ -81,7 +81,7 @@ PATCH()
 BUILD()
 {
 	autoreconf -fi
-	BOOST_ROOT=$portPackageLinksDir/devel~libboost_program_options/develop
+	BOOST_ROOT="$portPackageLinksDir"/devel~libboost_program_options/develop
 	runConfigure ./configure --enable-python=no
 	make $jobArgs
 }
@@ -90,13 +90,13 @@ INSTALL()
 {
 	make install
 
-	rm $libDir/libixion-$soVersion.la
+	rm -f "$libDir"/libixion-$soVersion.la
 
-	prepareInstalledDevelLibs libixion-$soVersion
+	prepareInstalledDevelLib libixion-$soVersion
 	fixPkgconfig
 
 	packageEntries devel \
-		$developDir
+		"$developDir"
 }
 
 TEST()