osdep/compiler.h: change license to LGPL

This didn't have a header and this was implied LGPL, but this was not
entirely correct. It turns out the printf attribute code was leaked in
from talloc, which is "LGPL v3 or later". talloc was added to the
mplayer2 code base in 27a30e310e. This remaining code was an oversight.

Since we want to reduce LGPL v3 code, replace this code with the one
from ta/ta.h. This code was explicitly written newly to get rid of
talloc and its license in 0933f12d28.

Copyright

@@ -157,7 +157,7 @@ LGPL relicensing status:
     osdep/android/*                 LGPL (BSD)
     osdep/ar/*                      LGPL (BSD)
     osdep/atomic.h                  LGPL
-    osdep/compiler.h                easy
+    osdep/compiler.h                LGPL
     osdep/endian.h                  easy
     osdep/glob-win.c                LGPL
     osdep/io.*                      LGPL

osdep/compiler.h

@@ -4,24 +4,18 @@
 #define MP_EXPAND_ARGS(...) __VA_ARGS__
 
 #ifdef __GNUC__
-
+#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format(printf, a1, a2)))
 #define MP_NORETURN __attribute__((noreturn))
-
-/** Use gcc attribute to check printf fns.  a1 is the 1-based index of
- * the parameter containing the format, and a2 the index of the first
- * argument. **/
-#if defined(__MINGW32__) && !defined(__clang__)
-// MinGW maps "printf" to the non-standard MSVCRT functions, even if
-// __USE_MINGW_ANSI_STDIO is defined and set to 1. We need to use "gnu_printf",
-// which isn't necessarily available on other GCC compatible compilers.
-#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (gnu_printf, a1, a2)))
-#else
-#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (printf, a1, a2)))
-#endif
-
 #else
 #define PRINTF_ATTRIBUTE(a1, a2)
 #define MP_NORETURN
 #endif
 
+// Broken crap with __USE_MINGW_ANSI_STDIO
+#if defined(__MINGW32__) && defined(__GNUC__) && !defined(__clang__)
+#undef PRINTF_ATTRIBUTE
+#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (gnu_printf, a1, a2)))
+#endif
+
+
 #endif