testing/libmysofa: enable on s390x

cmake3.5 is necessary because CMakeLists.txt specifies compatibility
with CMake < 3.5.

testing/libmysofa/APKBUILD

@@ -7,7 +7,6 @@ pkgdesc="Set of C functions to read AES SOFA files"
 url="https://github.com/hoene/libmysofa"
 license="BSD-3-Clause-Clear"
 arch="all"
-arch="$arch !s390x" # tests fail
 makedepends="
 	cmake
 	cunit-dev
@@ -21,14 +20,14 @@ source="$pkgname-$pkgver.tar.gz::https://github.com/hoene/libmysofa/archive/v$pk
 	"
 
 build() {
-	cmake -B build -G Ninja \
+	cmake3.5 -B build -G Ninja \
 		-DCMAKE_BUILD_TYPE=MinSizeRel \
 		-DCMAKE_INSTALL_PREFIX=/usr \
 		-DCMAKE_INSTALL_LIBDIR=lib \
 		-DCODE_COVERAGE=OFF \
 		-DBUILD_TESTS=ON \
 		-DBUILD_STATIC_LIBS=OFF
-	cmake --build build
+	cmake3.5 --build build
 }
 
 check() {