Compile md4c into QOwnNotes

Ideally QOwnNotes should use the system md4c but its not possible atm.

src/CMakeLists.txt

@@ -27,11 +27,6 @@ include_directories(libraries/sonnet/src/core)
 #some hunspell settings for windows
 include(libraries/sonnet/src/plugins/hunspell/hunspell/CMakeLists.txt)
 
-# noneed for md2html
-set(BUILD_MD2HTML_EXECUTABLE FALSE)
-set(BUILD_SHARED_LIBS OFF)
-add_subdirectory(libraries/md4c EXCLUDE_FROM_ALL)
-
 add_executable(QOwnNotes "")
 
 if (CMAKE_BUILD_TYPE MATCHES Debug)
@@ -475,6 +470,13 @@ list(APPEND SOURCE_FILES
     libraries/sonnet/src/plugins/hunspell/hunspell/src/parsers/xmlparser.hxx
 )
 
+# md4c
+list(APPEND SOURCE_FILES
+    libraries/md4c/src/md4c.c
+    libraries/md4c/src/md4c-html.c
+    libraries/md4c/src/entity.c
+)
+
 # Translation files
 SET(QON_TS_FILES
     languages/QOwnNotes_en.ts
@@ -573,7 +575,6 @@ target_link_libraries(QOwnNotes PRIVATE
     Botan::Botan
     fakevim
     Google::DiffMatchPatch
-    md4c-html
 )
 
 if (USE_QLITEHTML)