Merge commit '93797681c2310faeeb0158f66f471965213904c6'

* commit '93797681c2310faeeb0158f66f471965213904c6':
  build: Rename stdatomic_h variable to stdatomic

Merged-by: James Almer <jamrial@gmail.com>

configure

@@ -1929,7 +1929,6 @@ HEADERS_LIST="
     opencv2_core_core_c_h
     OpenGL_gl3_h
     poll_h
-    stdatomic_h
     sys_param_h
     sys_resource_h
     sys_select_h
@@ -5768,7 +5767,7 @@ check_header asm/types.h
 # it seems there are versions of clang in some distros that try to use the
 # gcc headers, which explodes for stdatomic
 # so we also check that atomics actually work here
-check_builtin stdatomic_h stdatomic.h "atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0)"
+check_builtin stdatomic stdatomic.h "atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0)"
 
 check_lib advapi32 "windows.h"            RegCloseKey          -ladvapi32
 check_lib ole32    "windows.h"            CoTaskMemFree        -lole32
@@ -6605,7 +6604,7 @@ for thread in $THREADS_LIST; do
     fi
 done
 
-if disabled stdatomic_h; then
+if disabled stdatomic; then
     if enabled atomics_gcc; then
         add_cppflags '-I\$(SRC_PATH)/compat/atomics/gcc'
     elif enabled atomics_win32; then