Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

cmake/Modules/FindBOTAN.cmake

@@ -0,0 +1,43 @@
+# - Find botan
+# Find the botan cryptographic library
+#
+# This module defines the following variables:
+#   BOTAN_FOUND  -  True if library and include directory are found
+# If set to TRUE, the following are also defined:
+#   BOTAN_INCLUDE_DIRS  -  The directory where to find the header file
+#   BOTAN_LIBRARIES  -  Where to find the library file
+#
+# For conveniance, these variables are also set. They have the same values
+# than the variables above.  The user can thus choose his/her prefered way
+# to write them.
+#   BOTAN_LIBRARY
+#   BOTAN_INCLUDE_DIR
+#
+# This file is in the public domain
+
+include(FindPkgConfig)
+
+pkg_check_modules(BOTAN botan-2)
+pkg_check_modules(BOTAN botan-1.11)
+
+if(NOT BOTAN_FOUND)
+  find_path(BOTAN_INCLUDE_DIRS NAMES botan/botan.h
+      PATH_SUFFIXES botan-2 botan-1.11
+      DOC "The botan include directory")
+
+  find_library(BOTAN_LIBRARIES NAMES botan botan-2 botan-1.11
+      DOC "The botan library")
+
+  # Use some standard module to handle the QUIETLY and REQUIRED arguments, and
+  # set BOTAN_FOUND to TRUE if these two variables are set.
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(BOTAN REQUIRED_VARS BOTAN_LIBRARIES BOTAN_INCLUDE_DIRS)
+
+  if(BOTAN_FOUND)
+    set(BOTAN_LIBRARY ${BOTAN_LIBRARIES} CACHE INTERNAL "")
+    set(BOTAN_INCLUDE_DIR ${BOTAN_INCLUDE_DIRS} CACHE INTERNAL "")
+    set(BOTAN_FOUND ${BOTAN_FOUND} CACHE INTERNAL "")
+  endif()
+endif()
+
+mark_as_advanced(BOTAN_INCLUDE_DIRS BOTAN_LIBRARIES)