[C++] Fix -Winvalid-offsetof warnings with g++ 4.4

[C++] Fix -Winvalid-offsetof warnings with g++ 4.4

Ref: https://sourceware.org/ml/gdb/2015-12/msg00014.html

Fixes the build in C++ mode with g++ 4.4:

 gdb/btrace.h: In function ‘size_t VEC_btrace_insn_s_embedded_size(int)’:
 gdb/btrace.h:84: error: invalid access to non-static data member ‘VEC_btrace_insn_s::vec’  of NULL object
 gdb/btrace.h:84: error: (perhaps the ‘offsetof’ macro was used incorrectly)
 gdb/btrace.h: In function ‘VEC_btrace_insn_s* VEC_btrace_insn_s_alloc(int)’:
 gdb/btrace.h:84: error: invalid access to non-static data member ‘VEC_btrace_insn_s::vec’  of NULL object
 gdb/btrace.h:84: error: (perhaps the ‘offsetof’ macro was used incorrectly)
 gdb/btrace.h: In function ‘VEC_btrace_insn_s* VEC_btrace_insn_s_copy(VEC_btrace_insn_s*)’:
 gdb/btrace.h:84: error: invalid access to non-static data member ‘VEC_btrace_insn_s::vec’  of NULL object
 gdb/btrace.h:84: error: (perhaps the ‘offsetof’ macro was used incorrectly)
 gdb/btrace.h: In function ‘VEC_btrace_insn_s* VEC_btrace_insn_s_merge(VEC_btrace_insn_s*, VEC_btrace_insn_s*)’:
 gdb/btrace.h:84: error: invalid access to non-static data member ‘VEC_btrace_insn_s::vec’  of NULL object
 gdb/btrace.h:84: error: (perhaps the ‘offsetof’ macro was used incorrectly)
 gdb/btrace.h: In function ‘int VEC_btrace_insn_s_reserve(VEC_btrace_insn_s**, int, const char*, unsigned int)’:
 gdb/btrace.h:84: error: invalid access to non-static data member ‘VEC_btrace_insn_s::vec’  of NULL object
 gdb/btrace.h:84: error: (perhaps the ‘offsetof’ macro was used incorrectly)

gdb/ChangeLog:
2015-12-16  Pedro Alves  <palves@redhat.com>

	* common/vec.h (vec_offset): New macro.
	(DEF_VEC_ALLOC_FUNC_I, DEF_VEC_ALLOC_FUNC_O): Use it instead of
	offsetof.