Add an include sub-directory to the tree

Blind attempt to fix Debian package brokenness managing
headers separately from install rules.

Global public headers that don't fit any of the Wireshark
libraries should be placed in include/.

Eventually the C files in the root dir should be placed somewhere
else as well (like src/) but this is not a priority.

Fixes #17726.

CMakeLists.txt

@@ -393,6 +393,7 @@ endif()
 include_directories(
 	${CMAKE_BINARY_DIR}
 	${CMAKE_SOURCE_DIR}
+	${CMAKE_SOURCE_DIR}/include
 )
 
 if( DUMPCAP_INSTALL_OPTION STREQUAL "suid" )
@@ -3439,12 +3440,12 @@ set(SHARK_PUBLIC_HEADERS
 	cfile.h
 	cli_main.h
 	file.h
-	ws_attributes.h
-	ws_compiler_tests.h
-	ws_diag_control.h
-	ws_log_defs.h
-	ws_symbol_export.h
-	wireshark.h
+	include/ws_attributes.h
+	include/ws_compiler_tests.h
+	include/ws_diag_control.h
+	include/ws_log_defs.h
+	include/ws_symbol_export.h
+	include/wireshark.h
 	${CMAKE_BINARY_DIR}/ws_version.h
 )
 

debian/libwsutil-dev.install

@@ -1,7 +1,4 @@
 usr/lib/*/libwsutil.so
-ws_attributes.h usr/include/wireshark
-ws_compiler_tests.h usr/include/wireshark
-ws_diag_control.h usr/include/wireshark
-ws_symbol_export.h usr/include/wireshark
+include/*.h usr/include/wireshark
 wsutil/*.h usr/include/wireshark/wsutil
 wsutil/wmem/*.h usr/include/wireshark/wsutil/wmem