Second attempt at fixing the windows/craft build

Since libspectre includes reference themselves with libspectre/ change
the cmake find_path to also include libspectre/ when doing the include
path search

cmake/modules/FindLibSpectre.cmake

@@ -34,9 +34,8 @@ if(_pc_LIBSPECTRE_FOUND)
     HINTS ${_pc_LIBSPECTRE_LIBRARY_DIRS} ${CMAKE_LIBRARY_PATH}
   )
 
-  find_path(LIBSPECTRE_INCLUDE_DIR spectre.h
+  find_path(LIBSPECTRE_INCLUDE_DIR libspectre/spectre.h
     HINTS ${_pc_LIBSPECTRE_INCLUDE_DIRS}
-    PATH_SUFFIXES libspectre
   )
 
   set(LIBSPECTRE_INTERNAL_FOUND TRUE)

generators/spectre/generator_ghostview.h

@@ -13,7 +13,7 @@
 #include <core/generator.h>
 #include <interfaces/configinterface.h>
 
-#include <spectre.h>
+#include <libspectre/spectre.h>
 
 class GSGenerator : public Okular::Generator, public Okular::ConfigInterface
 {

generators/spectre/rendererthread.h

@@ -16,7 +16,7 @@
 #include <QString>
 #include <QThread>
 
-#include <spectre.h>
+#include <libspectre/spectre.h>
 
 class QImage;
 class GSGenerator;