boost: Fix building with NDK r15c

packages/boost/libs-filesystem-src-operations.cpp.patch

@@ -0,0 +1,22 @@
+Do not define __USE_FILE_OFFSET64 as it causes fsetpos&fgetpos to be
+undefined on api levels lower than android-24.
+
+diff -u -r ../boost_1_64_0/libs/filesystem/src/operations.cpp ./libs/filesystem/src/operations.cpp
+--- ../boost_1_64_0/libs/filesystem/src/operations.cpp	2017-04-17 04:22:19.000000000 +0200
++++ ./libs/filesystem/src/operations.cpp	2017-08-08 10:08:13.607302273 +0200
+@@ -15,6 +15,7 @@
+ #define _FILE_OFFSET_BITS 64 // at worst, these defines may have no effect,
+ #endif
+ #if !defined(__PGI)
++#if !defined(__ANDROID__)
+ #define __USE_FILE_OFFSET64 // but that is harmless on Windows and on POSIX
+       // 64-bit systems or on 32-bit systems which don't have files larger 
+       // than can be represented by a traditional POSIX/UNIX off_t type. 
+@@ -25,6 +26,7 @@
+       // ensure that they are available to all included headers.
+       // That is required at least on Solaris, and possibly on other
+       // systems as well.
++#endif
+ #else
+ #define _FILE_OFFSET_BITS 64
+ #endif