dhparams: Fix .c file generation with OpenSSL >= 1.1.1-pre9

Since OpenSSL upstream commit 201b305a2409
("apps/dsaparam.c generates code that is intended to be pasted or included into
an existing source file: the function is static, and the code doesn't include
dsa.h.  Match the generated C source style of dsaparam.") "openssl dhparam -C"
generates the get_dh functions as static, but the functions are used inside
stream-ssl.c and so the static keyword cannot be used.

This commit removes the static keyword from the get_dh functions during
dhparams.c file generation by restoring the current behaviour.

Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

build-aux/generate-dhparams-c

@@ -25,6 +25,7 @@ EOF
 (openssl dhparam -C -in lib/dh1024.pem -noout &&
 openssl dhparam -C -in lib/dh2048.pem -noout &&
 openssl dhparam -C -in lib/dh4096.pem -noout) | sed '
+    s/^static DH/DH/
     s/\(get_dh[0-9]*\)()/\1(void)/
     s/\(DH_set0_pqg\)/my_\1/
     s/[ 	]*$//