build: Group external library protocols separately

configure

@@ -2519,15 +2519,8 @@ httpproxy_protocol_suggest="zlib"
 https_protocol_select="tls_protocol"
 https_protocol_suggest="zlib"
 icecast_protocol_select="http_protocol"
-librtmp_protocol_deps="librtmp"
-librtmpe_protocol_deps="librtmp"
-librtmps_protocol_deps="librtmp"
-librtmpt_protocol_deps="librtmp"
-librtmpte_protocol_deps="librtmp"
 mmsh_protocol_select="http_protocol"
 mmst_protocol_select="network"
-libsrt_protocol_deps="libsrt"
-libsrt_protocol_select="network"
 rtmp_protocol_conflict="librtmp_protocol"
 rtmp_protocol_select="tcp_protocol"
 rtmp_protocol_suggest="zlib"
@@ -2553,6 +2546,15 @@ udp_protocol_select="network"
 unix_protocol_deps="sys_un_h"
 unix_protocol_select="network"
 
+# external library protocols
+librtmp_protocol_deps="librtmp"
+librtmpe_protocol_deps="librtmp"
+librtmps_protocol_deps="librtmp"
+librtmpt_protocol_deps="librtmp"
+librtmpte_protocol_deps="librtmp"
+libsrt_protocol_deps="libsrt"
+libsrt_protocol_select="network"
+
 # filters
 asyncts_filter_deps="avresample"
 blackframe_filter_deps="gpl"

libavformat/Makefile

@@ -377,9 +377,8 @@ OBJS-$(CONFIG_YOP_DEMUXER)               += yop.o
 OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpegdec.o
 OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpegenc.o
 
-# external libraries
+# external library muxers/demuxers
 OBJS-$(CONFIG_AVISYNTH_DEMUXER)          += avisynth.o
-OBJS-$(CONFIG_LIBRTMP)                   += librtmp.o
 
 # protocols I/O
 OBJS-$(CONFIG_APPLEHTTP_PROTOCOL)        += hlsproto.o
@@ -414,7 +413,8 @@ OBJS-$(CONFIG_TLS_PROTOCOL)              += tls.o $(TLS-OBJS-yes)
 OBJS-$(CONFIG_UDP_PROTOCOL)              += udp.o
 OBJS-$(CONFIG_UNIX_PROTOCOL)             += unix.o
 
-# external libraries
+# external library protocols
+OBJS-$(CONFIG_LIBRTMP)                   += librtmp.o
 OBJS-$(CONFIG_LIBSRT_PROTOCOL)           += libsrt.o
 
 SKIPHEADERS-$(CONFIG_FFRTMPCRYPT_PROTOCOL) += rtmpdh.h