CMake: massage dependency-finding

- If KPMCore is not found, don't require the KF5 components
   that it would depend on.
 - If ECM is found, use KDEInstallDirs always, not just when
   the partitioning module is used.

CMakeLists.txt

@@ -269,6 +269,7 @@ if( ECM_FOUND )
         find_package( Qt5 COMPONENTS Test REQUIRED )
         include( ECMAddTests )
     endif()
+    include(KDEInstallDirs)
 endif()
 
 find_package( KF5 COMPONENTS CoreAddons Crash )

src/modules/fsresizer/CMakeLists.txt

@@ -1,10 +1,11 @@
 find_package( KPMcore 3.3 )
-find_package( Qt5 REQUIRED DBus )  # Needed for KPMCore
-find_package( KF5 REQUIRED I18n WidgetsAddons )  # Needed for KPMCore
 
 set( _partition_defs "" )
 
 if ( KPMcore_FOUND )
+    find_package( Qt5 REQUIRED DBus )  # Needed for KPMCore
+    find_package( KF5 REQUIRED I18n WidgetsAddons )  # Needed for KPMCore
+
     include_directories( ${KPMCORE_INCLUDE_DIR} )
     include_directories( ${PROJECT_BINARY_DIR}/src/libcalamares )
 

src/modules/partition/CMakeLists.txt

@@ -15,11 +15,6 @@ endif()
 
 find_package(ECM ${ECM_VERSION} REQUIRED NO_MODULE)
 
-include(KDEInstallDirs)
-include(GenerateExportHeader)
-find_package( Qt5 REQUIRED DBus )
-find_package( KF5 REQUIRED Config CoreAddons I18n WidgetsAddons )
-
 find_package( KPMcore 3.3 )
 set_package_properties(
     KPMcore PROPERTIES
@@ -27,6 +22,9 @@ set_package_properties(
 )
 
 if ( KPMcore_FOUND )
+    find_package( Qt5 REQUIRED DBus )
+    find_package( KF5 REQUIRED Config CoreAddons I18n WidgetsAddons )
+
     if ( KPMcore_VERSION VERSION_GREATER "3.3.0")
         list( APPEND _partition_defs WITH_KPMCORE331API) # kpmcore > 3.3.0 with deprecations
     endif()