Remove: Remove xml_split / xml-twig-tools dependency

This optional dependency is no longer needed with the new XML file
iterator.

.docker/prod.Dockerfile

@@ -100,7 +100,6 @@ RUN apt-get update && \
     texlive-fonts-recommended \
     texlive-latex-extra \
     wget \
-    xml-twig-tools \
     xmlstarlet \
     xsltproc \
     zip && \

INSTALL.md

@@ -705,9 +705,6 @@ Prerequisites for S/MIME support (e.g. email encryption):
 Prerequisites for certificate generation:
 * GnuTLS certtool (Debian package: gnutls-bin)
 
-Prerequisites (recommended) to lower sync RAM usage
-* xml_split (Debian package: xml-twig-tools)
-
 ## Static code analysis with the Clang Static Analyzer
 
 If you want to use the Clang Static Analyzer (https://clang-analyzer.llvm.org/)

src/CMakeLists.txt

@@ -55,14 +55,6 @@ elseif ((CMAKE_MATCH_1 EQUAL 9 AND CMAKE_MATCH_2 LESS 6)
   message (STATUS "PostgreSQL version ${CMAKE_MATCH_1}.${CMAKE_MATCH_2}${CMAKE_MATCH_3}")
 endif (NOT CMAKE_MATCH_1)
 
-message (STATUS "Looking for xml_split...")
-find_program (XML_SPLIT_EXECUTABLE xml_split DOC "xml_split")
-if (NOT XML_SPLIT_EXECUTABLE)
-  message (WARNING "xml_split is recommended to reduce SCAP sync memory usage (Debian package xml-twig-tools).")
-else (NOT XML_SPLIT_EXECUTABLE)
-  message (STATUS "Looking for xml_split... ${XML_SPLIT_EXECUTABLE}")
-endif (NOT XML_SPLIT_EXECUTABLE)
-
 message (STATUS "Looking for xsltproc...")
 find_program (XSLTPROC_EXECUTABLE xsltproc DOC "xsltproc")
 if (NOT XSLTPROC_EXECUTABLE)