Use '#if defined()' for OS-specific preprocessor checks.

Avoids some warnings about undefined preprocessor directives.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16869 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

diff --git a/libavcodec/ppc/check_altivec.c b/libavcodec/ppc/check_altivec.c
index 417c768df430922efad27affa310ca54ab7c3543..6e38f9c75d66fff9d0d2f028ab52a923370f61de 100644 (file)
--- a/libavcodec/ppc/check_altivec.c
+++ b/libavcodec/ppc/check_altivec.c
@@ -25,11 +25,11 @@
 #ifdef __APPLE__
 #undef _POSIX_C_SOURCE
 #include <sys/sysctl.h>
-#elif __OpenBSD__
+#elif defined(__OpenBSD__)
 #include <sys/param.h>
 #include <sys/sysctl.h>
 #include <machine/cpu.h>
-#elif __AMIGAOS4__
+#elif defined(__AMIGAOS4__)
 #include <exec/exec.h>
 #include <interfaces/exec.h>
 #include <proto/exec.h>