devel/libssh: Remove -pedantic-error flags and reset port

This port breaks if it violates standards according to the -pedantic flag.
Accord to gcc-5, it indeed does with dozens of warnings like this:

/wrkdirs/security/libssh/work/libssh-0.6.3/include/libssh/priv.h:200:33:
  error: ISO C does not support '__FUNCTION__' predefined identifier
  [-Wpedantic] _ssh_set_error(error, code, __FUNCTION__, __VA_ARGS__)

The maintainer has been MIA for over a year with PRs on 8 ports.  I'm not
waiting for this one to time out too.  While here, reset MAINTAINER.

PR:		197785
Submitted by:	marino
Approved by:	maintainer reset

security/libssh/Makefile

@@ -7,7 +7,7 @@ PORTREVISION=	1
 CATEGORIES=	security devel
 MASTER_SITES=	https://red.libssh.org/attachments/download/87/
 
-MAINTAINER=	fluffy@FreeBSD.org
+MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Library implementing the SSH1 and SSH2 protocol
 
 LICENSE=	LGPL21
@@ -49,5 +49,7 @@ post-patch:
 	@${REINPLACE_CMD} -e 's|-lssh_threads|-lssh_threads ${PTHREAD_LIBS}|' \
 		-e 's|$${INCLUDE_INSTALL_DIR}|$${INCLUDE_INSTALL_DIR} ${PTHREAD_CFLAGS}|' \
 		${WRKSRC}/libssh_threads.pc.cmake
+	@${REINPLACE_CMD} -e 's| -pedantic-errors||' \
+		${WRKSRC}/cmake/Modules/DefineCompilerFlags.cmake
 
 .include <bsd.port.mk>