libebml4: clean up

dev-libs/libebml/libebml4-1.3.10.recipe

@@ -3,7 +3,7 @@ DESCRIPTION="libebml is a C++ library to parse EBML content (read/write)."
 HOMEPAGE="https://github.com/Matroska-Org/libebml/"
 COPYRIGHT="2005-2019 Matroska"
 LICENSE="GNU LGPL v2.1"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="$HOMEPAGE/archive/release-$portVersion.tar.gz"
 CHECKSUM_SHA256="2562bb9bc3248e956a6ed1148eafe4d7d68759257133083c212d14faa8709d1e"
 SOURCE_DIR="libebml-release-$portVersion"
@@ -32,10 +32,9 @@ BUILD_PREREQUIRES="
 
 BUILD()
 {
-	mkdir -p build && cd build
-	cmake .. $cmakeDirArgs -DBUILD_SHARED_LIBS=TRUE \
+	cmake -Bbuild -S. $cmakeDirArgs -DBUILD_SHARED_LIBS=TRUE \
 		-DCMAKE_BUILD_TYPE=Release
-	make $jobArgs
+	make -C build $jobArgs
 }
 
 INSTALL()