RTEMS | lpc32xx: Multiple Warnings for empty structures (#5295)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5295



## Summary

Every variant of the lpc32xx BSP family includes these warnings for their being a set of empty structures. 

```
In file included from ../../../bsps/arm/lpc32xx/include/bsp.h:57,
                 from ../../../testsuites/support/include/tmacros.h:41,
                 from ../../../testsuites/sptests/spstdc17/init.c:34:
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:240:9: warning: struct has no members [-Wpedantic]
  240 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:243:9: warning: struct has no members [-Wpedantic]
  243 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:246:9: warning: struct has no members [-Wpedantic]
  246 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:249:9: warning: struct has no members [-Wpedantic]
  249 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:252:9: warning: struct has no members [-Wpedantic]
  252 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:255:9: warning: struct has no members [-Wpedantic]
  255 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:258:9: warning: struct has no members [-Wpedantic]
  258 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:261:9: warning: struct has no members [-Wpedantic]
  261 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:264:9: warning: struct has no members [-Wpedantic]
  264 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:267:9: warning: struct has no members [-Wpedantic]
  267 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:270:9: warning: struct has no members [-Wpedantic]
  270 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:273:9: warning: struct has no members [-Wpedantic]
  273 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:347:9: warning: struct has no members [-Wpedantic]
  347 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:350:9: warning: struct has no members [-Wpedantic]
  350 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:353:9: warning: struct has no members [-Wpedantic]
  353 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:356:9: warning: struct has no members [-Wpedantic]
  356 | typedef struct {
      |         ^~~~~~
../../../bsps/arm/lpc32xx/include/bsp/lpc32xx.h:359:9: warning: struct has no members [-Wpedantic]
  359 | typedef struct {
```


## Steps to reproduce

Build the BSP with all tests enabled. This is from spstdc17.

### Pre-set options

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5295
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