devel/massiv-visualizer: add missing build-dependency on ecm

devel/massif-visualizer/Makefile

@@ -21,7 +21,8 @@ GH_TAGNAME=	v0.7.0
 USE_KDE= 	archive  auth  auth  codecs  completion  config  config  \
 			configwidgets  coreaddons  i18n  jobwidgets  kio parts  service  \
 			solid sonnet texteditor textwidgets  widgetsaddons  windowsystem  \
-			xmlgui
+			xmlgui \
+			ecm:build
 USE_QT=		concurrent core dbus gui network printsupport svg widgets xml \
 			buildtools:build qmake:build testlib:build
 USE_XORG=	x11