[misc. platform-specific druntime fixes]

Author: kinke

runtime/druntime/src/core/thread/fiber/package.d

@@ -18,7 +18,12 @@ import core.thread.threadgroup;
 import core.thread.types;
 
 import core.memory : pageSize;
-version (LDC) import ldc.llvmasm;
+
+version (LDC)
+{
+    import ldc.attributes;
+    import ldc.llvmasm;
+}
 
 ///////////////////////////////////////////////////////////////////////////////
 // Fiber Platform Detection

runtime/druntime/src/rt/cover.d

@@ -27,7 +27,7 @@ else version (Posix)
 {
     import core.stdc.stdio : fopen;
     import core.sys.posix.fcntl : O_CREAT, O_RDWR, open, S_IRGRP, S_IROTH, S_IRUSR, S_IWGRP, S_IWOTH, S_IWUSR;
-    import core.sys.posix.unistd : F_LOCK, ftruncate, lockf;
+    import core.sys.posix.unistd : ftruncate;
 }
 else
     static assert(0, "Unsupported platform");
@@ -487,7 +487,10 @@ void lockFile(int fd)
         flock(fd, LOCK_EX); // exclusive lock
     }
     else version (Posix)
+    {
+        import core.sys.posix.unistd : F_LOCK, lockf;
         lockf(fd, F_LOCK, 0); // exclusive lock
+    }
     else version (Windows)
     {
         OVERLAPPED off;

runtime/druntime/src/rt/sections_elf_shared.d

@@ -50,13 +50,17 @@ import core.memory;
 import core.stdc.config : c_ulong;
 import core.stdc.stdlib : calloc, free, malloc;
 version (Shared) import core.sync.mutex;
-import core.sys.posix.pthread : pthread_mutex_destroy, pthread_mutex_init, pthread_mutex_lock, pthread_mutex_unlock;
-import core.sys.posix.sys.types : pthread_mutex_t;
 import rt.deh;
 import rt.dmain2;
 import rt.minfo;
 import rt.util.utility : safeAssert;
 
+version (Posix)
+{
+    import core.sys.posix.pthread : pthread_mutex_destroy, pthread_mutex_init, pthread_mutex_lock, pthread_mutex_unlock;
+    import core.sys.posix.sys.types : pthread_mutex_t;
+}
+
 version (linux)
 {
     import core.sys.linux.dlfcn : Dl_info, dladdr, dlclose, dlinfo, dlopen, RTLD_DI_LINKMAP, RTLD_LAZY, RTLD_NOLOAD;