Bug 332006: Remove an old cairo patch r=jrmuizel

This patch hasn't been touched in ten years and the code it affects does not
appear in the file, so I think it is old an unused.

Differential Revision: https://phabricator.services.mozilla.com/D159514

gfx/cairo/win32-inline-cpp-keyword.patch

@@ -1,24 +0,0 @@
-diff --git a/gfx/cairo/cairo/src/cairo-compiler-private.h b/gfx/cairo/cairo/src/cairo-compiler-private.h
---- a/gfx/cairo/cairo/src/cairo-compiler-private.h
-+++ b/gfx/cairo/cairo/src/cairo-compiler-private.h
-@@ -205,18 +205,20 @@
- #if (defined(__WIN32__) && !defined(__WINE__)) || defined(_MSC_VER)
- #define snprintf _snprintf
- #define popen _popen
- #define pclose _pclose
- #define hypot _hypot
- #endif
- 
- #ifdef _MSC_VER
-+#ifndef __cplusplus
- #undef inline
- #define inline __inline
-+#endif
- 
- /* there are currently linkage problems that arise when trying to include intrin.h in c++:
-  * D:\sdks\v7.0\include\winnt.h(3674) : error C2733: second C linkage of overloaded function '_interlockedbittestandset' not allowed
-  * so avoid defining ffs in c++ code for now */
- #ifndef  __cplusplus
- /* Add a definition of ffs */
- #include <intrin.h>
- #pragma intrinsic(_BitScanForward)