dist: include curl_multi_socket_all.3

Closes https://github.com/curl/curl/pull/816

docs/libcurl/Makefile.am

@@ -41,7 +41,7 @@ man_MANS = curl_easy_cleanup.3 curl_easy_getinfo.3 curl_easy_init.3	 \
  curl_multi_timeout.3 curl_formget.3 curl_multi_assign.3		 \
  curl_easy_pause.3 curl_easy_recv.3 curl_easy_send.3			 \
  curl_multi_socket_action.3 curl_multi_wait.3 libcurl-symbols.3 	 \
- libcurl-thread.3
+ libcurl-thread.3 curl_multi_socket_all.3
 
 HTMLPAGES = curl_easy_cleanup.html curl_easy_getinfo.html		\
  curl_easy_init.html curl_easy_perform.html curl_easy_setopt.html	\
@@ -62,7 +62,7 @@ HTMLPAGES = curl_easy_cleanup.html curl_easy_getinfo.html		\
  curl_multi_timeout.html curl_formget.html curl_multi_assign.html	\
  curl_easy_pause.html curl_easy_recv.html curl_easy_send.html		\
  curl_multi_socket_action.html curl_multi_wait.html			\
- libcurl-symbols.html libcurl-thread.html
+ libcurl-symbols.html libcurl-thread.html curl_multi_socket_all.html
 
 PDFPAGES = curl_easy_cleanup.pdf curl_easy_getinfo.pdf			 \
  curl_easy_init.pdf curl_easy_perform.pdf curl_easy_setopt.pdf		 \
@@ -82,7 +82,8 @@ PDFPAGES = curl_easy_cleanup.pdf curl_easy_getinfo.pdf			 \
  curl_multi_setopt.pdf curl_multi_socket.pdf curl_multi_timeout.pdf	 \
  curl_formget.pdf curl_multi_assign.pdf curl_easy_pause.pdf		 \
  curl_easy_recv.pdf curl_easy_send.pdf curl_multi_socket_action.pdf 	 \
- curl_multi_wait.pdf libcurl-symbols.pdf libcurl-thread.pdf
+ curl_multi_wait.pdf libcurl-symbols.pdf libcurl-thread.pdf		 \
+ curl_multi_socket_all.pdf
 
 m4macrodir = $(datadir)/aclocal
 dist_m4macro_DATA = libcurl.m4