Merge pull request #11031 from poettering/gcc-attr-cleanup

various gcc attribute clean-ups

diff --cc src/basic/hashmap.c
Simple merge

diff --cc src/basic/macro.h
Simple merge

diff --cc src/basic/static-destruct.h
Simple merge

diff --cc src/systemd/_sd-common.h
index 9950339d5447d153965e26c2be3d4db01b454112,6fd9244a0168913d5a54ffe154d2286a4941a594..05c38008cf6dcbd9f0d26c59952adc7df50ff2ef
--- 1/src/systemd/_sd-common.h
--- 2/src/systemd/_sd-common.h
+++ b/src/systemd/_sd-common.h
@@@ -23,11 -23,9 +23,11 @@@
  #  error "Do not include _sd-common.h directly; it is a private header."
  #endif
  
 +typedef void (*_sd_destroy_t)(void *userdata);
 +
  #ifndef _sd_printf_
  #  if __GNUC__ >= 4
- #    define _sd_printf_(a,b) __attribute__ ((__format__(printf, a, b)))
+ #    define _sd_printf_(a,b) __attribute__((__format__(printf, a, b)))
  #  else
  #    define _sd_printf_(a,b)
  #  endif