sys-cluster/adios2: build testing utils with python

Closes: https://bugs.gentoo.org/850718
Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

sys-cluster/adios2/adios2-2.8.1-r1.ebuild

@@ -109,7 +109,7 @@ src_configure() {
 		-DADIOS2_USE_SZ="$(usex szip)"
 		-DADIOS2_USE_ZeroMQ="$(usex zeromq)"
 		-DADIOS2_USE_ZFP="$(usex zfp)"
-		-DBUILD_TESTING=$(usex test)
+		-DBUILD_TESTING="$(usex python)"
 	)
 	cmake_src_configure
 }
@@ -121,10 +121,6 @@ src_prepare() {
 	cmake_src_prepare
 }
 
-src_compile() {
-	cmake_src_compile
-}
-
 src_install() {
 	cmake_src_install
 	dodoc ReadMe.md