Remove <sys/statvfs.h> inlines for API level 19.

API level 19 is no longer supported by the NDK.

While I'm here, let's remove the duplicated structure defintion (as
we've already done for `struct stat`).

Test: treehugger
Change-Id: I9d8286f9e7ba803f3131b6dcb0486ff1b0f9d5d1
diff --git a/libc/include/sys/statvfs.h b/libc/include/sys/statvfs.h
index 93fa3d7..793ee13 100644
--- a/libc/include/sys/statvfs.h
+++ b/libc/include/sys/statvfs.h
@@ -27,63 +27,39 @@
 
 __BEGIN_DECLS
 
-struct statvfs {
-  /** Block size. */
-  unsigned long f_bsize;
-  /** Fragment size. */
-  unsigned long f_frsize;
-  /** Total size of filesystem in `f_frsize` blocks. */
-  fsblkcnt_t f_blocks;
-  /** Number of free blocks. */
-  fsblkcnt_t f_bfree;
-  /** Number of free blocks for non-root. */
-  fsblkcnt_t f_bavail;
-  /** Number of inodes. */
-  fsfilcnt_t f_files;
-  /** Number of free inodes. */
-  fsfilcnt_t f_ffree;
-  /** Number of free inodes for non-root. */
-  fsfilcnt_t f_favail;
-  /** Filesystem id. */
-  unsigned long f_fsid;
-  /** Mount flags. (See `ST_` constants.) */
-  unsigned long f_flag;
-  /** Maximum filename length. */
-  unsigned long f_namemax;
+#define __STATVFS64_BODY \
+  /** Block size. */ \
+  unsigned long f_bsize; \
+  /** Fragment size. */ \
+  unsigned long f_frsize; \
+  /** Total size of filesystem in `f_frsize` blocks. */ \
+  fsblkcnt_t f_blocks; \
+  /** Number of free blocks. */ \
+  fsblkcnt_t f_bfree; \
+  /** Number of free blocks for non-root. */ \
+  fsblkcnt_t f_bavail; \
+  /** Number of inodes. */ \
+  fsfilcnt_t f_files; \
+  /** Number of free inodes. */ \
+  fsfilcnt_t f_ffree; \
+  /** Number of free inodes for non-root. */ \
+  fsfilcnt_t f_favail; \
+  /** Filesystem id. */ \
+  unsigned long f_fsid; \
+  /** Mount flags. (See `ST_` constants.) */ \
+  unsigned long f_flag; \
+  /** Maximum filename length. */ \
+  unsigned long f_namemax; \
 
 #if defined(__LP64__)
-  uint32_t __f_reserved[6];
+#define __STATVFS64_CODA uint32_t __f_reserved[6];
+#else
+#define __STATVFS64_CODA
 #endif
-};
 
-struct statvfs64 {
-  /** Block size. */
-  unsigned long f_bsize;
-  /** Fragment size. */
-  unsigned long f_frsize;
-  /** Total size of filesystem in `f_frsize` blocks. */
-  fsblkcnt_t f_blocks;
-  /** Number of free blocks. */
-  fsblkcnt_t f_bfree;
-  /** Number of free blocks for non-root. */
-  fsblkcnt_t f_bavail;
-  /** Number of inodes. */
-  fsfilcnt_t f_files;
-  /** Number of free inodes. */
-  fsfilcnt_t f_ffree;
-  /** Number of free inodes for non-root. */
-  fsfilcnt_t f_favail;
-  /** Filesystem id. */
-  unsigned long f_fsid;
-  /** Mount flags. (See `ST_` constants.) */
-  unsigned long f_flag;
-  /** Maximum filename length. */
-  unsigned long f_namemax;
+struct statvfs { __STATVFS64_BODY __STATVFS64_CODA };
 
-#if defined(__LP64__)
-  uint32_t __f_reserved[6];
-#endif
-};
+struct statvfs64 { __STATVFS64_BODY __STATVFS64_CODA };
 
 /** Flag for `f_flag` in `struct statvfs`: mounted read-only. */
 #define ST_RDONLY      0x0001
@@ -112,14 +88,13 @@
 /** Flag for `f_flag` in `struct statvfs`: see `MS_RELATIME`. */
 #define ST_RELATIME    0x1000
 
-#if __ANDROID_API__ >= 19
-// These functions are implemented as static inlines before API level 19.
-
 /**
  * [statvfs(3)](http://man7.org/linux/man-pages/man3/statvfs.3.html)
  * queries filesystem statistics for the given path.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ *
+ * Available since API level 19.
  */
 int statvfs(const char* __path, struct statvfs* __buf) __INTRODUCED_IN(19);
 
@@ -128,22 +103,15 @@
  * queries filesystem statistics for the given file descriptor.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ *
+ * Available since API level 19.
  */
 int fstatvfs(int __fd, struct statvfs* __buf) __INTRODUCED_IN(19);
 
-#endif
-
-#if __ANDROID_API__ >= 21
-// These functions are implemented as static inlines before API level 21.
-
-/** Equivalent to statvfs(). */
+/** Equivalent to statvfs() . */
 int statvfs64(const char* __path, struct statvfs64* __buf) __INTRODUCED_IN(21);
 
 /** Equivalent to fstatvfs(). */
 int fstatvfs64(int __fd, struct statvfs64* __buf) __INTRODUCED_IN(21);
 
-#endif
-
 __END_DECLS
-
-#include <android/legacy_sys_statvfs_inlines.h>