errno/ENOSYS undefined building under OpenSUSE

[tonycurtis]

 make[2]: Entering directory `/home/tonyc/src/ornl/ucx/project/build/src/uct'
  CC       ib/base/libuct_la-ib_context.lo
 In file included from ../../../source/src/uct/ib/base/ib_device.h:11:0,
                 from ../../../source/src/uct/ib/base/ib_context.h:11,
                 from ../../../source/src/uct/ib/base/ib_context.c:8:
 ../../../source/src/uct/ib/base/ib_verbs.h: In function 'ibv_exp_cq_ignore_overrun':
 ../../../source/src/uct/ib/base/ib_verbs.h:88:5: error: 'errno' undeclared (first use in this function)
 ../../../source/src/uct/ib/base/ib_verbs.h:88:5: note: each undeclared identifier is reported only once for  each function it appears in
 ../../../source/src/uct/ib/base/ib_verbs.h:88:13: error: 'ENOSYS' undeclared (first use in this function)
 make[2]: *** [ib/base/libuct_la-ib_context.lo] Error 1

Will do pull-request

[shamisp]

solved by #33