phobos: Fixes for GNU/Hurd.

Author: yelninei

Makefile

@@ -305,7 +305,7 @@ else
 endif
 
 # build with shared library support (defaults to true on supported platforms)
-SHARED=$(if $(findstring $(OS),linux freebsd),1,)
+SHARED=$(if $(findstring $(OS),linux freebsd hurd),1,)
 
 TESTS_EXTRACTOR=$(ROOT)/tests_extractor$(DOTEXE)
 PUBLICTESTS_DIR=$(ROOT)/publictests

std/datetime/timezone.d

@@ -338,6 +338,7 @@ public:
             else version (linux)         enum utcZone = "UTC";
             else version (Darwin)        enum utcZone = "UTC";
             else version (Solaris)       enum utcZone = "UTC";
+            else version (Hurd)          enum utcZone = "UTC";
             else static assert(0, "The location of the UTC timezone file on this Posix platform must be set.");
 
             auto tzs = [testTZ("America/Los_Angeles", "PST", "PDT", dur!"hours"(-8), dur!"hours"(1)),

std/math/algebraic.d

@@ -631,6 +631,7 @@ else version (FreeBSD)      version = GenericPosixVersion;
 else version (OpenBSD)      version = GenericPosixVersion;
 else version (Solaris)      version = GenericPosixVersion;
 else version (DragonFlyBSD) version = GenericPosixVersion;
+else version (Hurd)         version = GenericPosixVersion;
 
 private real polyImpl(real x, in real[] A) @trusted pure nothrow @nogc
 {

std/process.d

@@ -1031,6 +1031,8 @@ private Pid spawnProcessPosix(scope const(char[])[] args,
                     import core.sys.freebsd.unistd : closefrom;
                 else version (OpenBSD)
                     import core.sys.openbsd.unistd : closefrom;
+                else version (Hurd)
+                    import core.sys.hurd.unistd : closefrom;
 
                 static if (!__traits(compiles, closefrom))
                 {