[build] build seafile concurrently

[ghost]

Have you faced the situation where some kind of bus error or some strange error like this occurrs:

make[2]: Entering directory `/home/travis/build/Chilledheart/ccnet/net/daemon'
gcc -DHAVE_CONFIG_H -I. -I../.. -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -DCCNET_DAEMON -I../../net/common -I../../include -I../../include/ccnet -I../../lib -I../../include -I../../lib -pthread -I/usr/local/include -I/usr/local/include/searpc -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -Wall -g -O2 -MT rpc-service.o -MD -MP -MF .deps/rpc-service.Tpo -c -o rpc-service.o `test -f '../common/rpc-service.c' || echo './'`../common/rpc-service.c
In file included from ../common/rpc-service.c:41:0:
../../lib/searpc-marshal.h:1047:13: error: redefinition of ‘register_marshals’
../../lib/searpc-marshal.h:832:13: note: previous definition of ‘register_marshals’ was here
../../lib/searpc-marshal.h:832:13: warning: ‘register_marshals’ defined but not used [-Wunused-function]

You would probably execute make clean or git clean -xfd and ignore these annoying erros by just make -j1... until now.

PROGRESS

• libsearpc [lib] fix searpc codegen issue libsearpc#17
• ccnet https://github.com/haiwen/ccnet/pull/61
• seafile [build] fix bus error while execute make -jN (N>1) #747

After these works get merged, you can use make -jN safely (N>1)

[ghost]

All work ready for merge

[lins05]

I've merge them all. Now we can build libsearpc/ccnet/seafile with make -jN, cool!

[ghost]

Great!
Thanks for your test work, @lins05 !