Remove RNG since there is no longer a public API exposed to use the RNG. The RNG in libsrtp wasn't using a particularly good random source anyway.  Downstream applications should use OpenSSL or some other random source that's compliant with SP-800-90.
diff --git a/configure b/configure
index e775d72..2bbc1ab 100755
--- a/configure
+++ b/configure
@@ -627,7 +627,6 @@
 PKG_CONFIG
 HAVE_PCAP
 HMAC_OBJS
-RNG_OBJS
 AES_ICM_OBJS
 USE_OPENSSL
 EXE
@@ -4073,6 +4072,7 @@
 	* )
 
 $as_echo "#define CPU_RISC 1" >>confdefs.h
+
 	;;
 esac
 
@@ -4949,7 +4949,6 @@
 $as_echo "#define OPENSSL 1" >>confdefs.h
 
    AES_ICM_OBJS="crypto/cipher/aes_icm_ossl.o crypto/cipher/aes_gcm_ossl.o"
-   RNG_OBJS=rand_source_ossl.o
    HMAC_OBJS=crypto/hash/hmac_ossl.o
    USE_OPENSSL=1
 
@@ -4957,7 +4956,6 @@
    AES_ICM_OBJS="crypto/cipher/aes_icm.o crypto/cipher/aes.o"
    { $as_echo "$as_me:${as_lineno-$LINENO}: checking which random device to use" >&5
 $as_echo_n "checking which random device to use... " >&6; }
-   RNG_OBJS=rand_source.o
    if test -n "$DEV_URANDOM"; then
 
 cat >>confdefs.h <<_ACEOF
@@ -4975,7 +4973,6 @@
 
 
 
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pcap_create in -lpcap" >&5
 $as_echo_n "checking for pcap_create in -lpcap... " >&6; }
 if ${ac_cv_lib_pcap_pcap_create+:} false; then :
@@ -6400,7 +6397,6 @@
 as_dir=crypto/kernel; as_fn_mkdir_p
 as_dir=crypto/math; as_fn_mkdir_p
 as_dir=crypto/replay; as_fn_mkdir_p
-as_dir=crypto/rng; as_fn_mkdir_p
 as_dir=crypto/test; as_fn_mkdir_p
 as_dir=doc; as_fn_mkdir_p
 as_dir=srtp; as_fn_mkdir_p