Two fixes for Bionic

src/core/stdc/math.d

@@ -44,6 +44,13 @@ version (FreeBSD)
     ///
     enum int FP_ILOGBNAN      = int.max;
 }
+else version (CRuntime_Bionic)
+{
+    ///
+    enum int FP_ILOGB0        = -int.max;
+    ///
+    enum int FP_ILOGBNAN      = int.max;
+}
 else
 {
     ///

src/core/sys/posix/fcntl.d

@@ -486,6 +486,8 @@ else version( CRuntime_Bionic )
     enum F_WRLCK        = 1;
     enum F_UNLCK        = 2;
 
+    enum LOCK_EX        = 2;
+
     version (X86)
     {
         enum O_CREAT        = 0x40;     // octal     0100

src/core/sys/posix/unistd.d

@@ -1258,6 +1258,7 @@ else version( FreeBSD )
 else version( CRuntime_Bionic )
 {
     int        fchdir(int) @trusted;
+    int        flock(int, int) @trusted;
     pid_t      getpgid(pid_t) @trusted;
     int        lchown(in char*, uid_t, gid_t);
     int        nice(int) @trusted;

src/rt/cover.d

@@ -394,7 +394,9 @@ version (Windows) HANDLE handle(int fd)
 
 void lockFile(int fd)
 {
-    version (Posix)
+    version (CRuntime_Bionic)
+        core.sys.posix.unistd.flock(fd, LOCK_EX); // exclusive lock
+    else version (Posix)
         lockf(fd, F_LOCK, 0); // exclusive lock
     else version (Windows)
     {