compat/strings.h: IWYU export strings.h

The includer needs no longer use IWYU pragmas for strcasecmp in *NIX.

In Windows, _stricmp is defined in string.h, which is not currently
exported (it contains more symbols so it isn't specific enough, in
contrary to POSIX strings.h which contains just strcasecmp and ffs
family).

Author: MartinPulec

src/compat/strings.h

@@ -40,7 +40,7 @@
 #ifndef COMPAT_STRINGS_H_D54CAFC8_A1A0_4FF5_80A0_91F34FB11E12
 #define COMPAT_STRINGS_H_D54CAFC8_A1A0_4FF5_80A0_91F34FB11E12
 
-#include <string.h>
+#include <string.h> // for strerror
 
 #ifdef _WIN32
 #ifndef strcasecmp
@@ -50,7 +50,7 @@
 #define strncasecmp _strnicmp
 #endif // ! defined strncasecmp
 #else // ! defined _WIN32
-#include <strings.h>
+#include <strings.h> // IWYU pragma: export
 #endif // _WIN32
 
 #ifdef __cplusplus

src/video_compress/gpujpeg.cpp

@@ -57,8 +57,7 @@
 #include <utility>                       // for move
 #include <vector>
 
-#include "compat/strings.h"              // IWYU pragma: keep // for strcasecmp
-// IWYU pragma: no_include <strings.h> # via compact/strings.h
+#include "compat/strings.h"              // for strcasecmp
 #include "debug.h"
 #include "host.h"
 #include "lib_common.h"