Possible alias warning on certain compiler versions

[jphickey]

Is your feature request related to a problem? Please describe.
When getting the address of a memory pool buffer directly as a CFE_SB_BufferD_t * type, it may trigger an alias warning in certain compilers/configurations.

Example when using -O3 -fstrict-aliasing -Wstrict-aliasing=2 on GCC 10.3:

cfe/modules/sb/fsw/src/cfe_sb_buf.c: In function ‘CFE_SB_GetBufferFromPool’:
cfe/modules/sb/fsw/src/cfe_sb_buf.c:115:54: error: dereferencing type-punned pointer might break strict-aliasing rules [-Werror=strict-aliasing]
  115 |     stat1 = CFE_ES_GetPoolBuf((CFE_ES_MemPoolBuf_t *)&bd, CFE_SB_Global.Mem.PoolHdl, AllocSize);
      |                                                      ^~~
cfe/modules/sb/fsw/src/cfe_sb_buf.c: In function ‘CFE_SB_GetDestinationBlk’:
cfe/modules/sb/fsw/src/cfe_sb_buf.c:221:53: error: dereferencing type-punned pointer might break strict-aliasing rules [-Werror=strict-aliasing]
  221 |     Stat = CFE_ES_GetPoolBuf((CFE_ES_MemPoolBuf_t *)&Dest, CFE_SB_Global.Mem.PoolHdl, sizeof(CFE_SB_DestinationD_t));
      |                                                     ^~~~~

Describe the solution you'd like
Should build clean

Additional context
Using a local CFE_ES_MemPoolBuf_t intermediate value should avoid this.

Requester Info
Joseph Hickey, Vantage Systems, Inc.