Add missing declarations for Solaris.

- core.sys.posix.grp is not yet implemented
- typo in core.sys.posix.unistd.d

src/core/sys/posix/grp.d

@@ -68,6 +68,16 @@ else version( FreeBSD )
         char**  gr_mem;
     }
 }
+else version( Solaris )
+{
+    struct group
+    {
+        char*   gr_name;
+        char*   gr_passwd;
+        gid_t   gr_gid;
+        char**  gr_mem;
+    }
+}
 else version( Android )
 {
     struct group
@@ -109,6 +119,11 @@ else version( FreeBSD )
     int getgrnam_r(in char*, group*, char*, size_t, group**);
     int getgruid_r(gid_t, group*, char*, size_t, group**);
 }
+else version( Solaris )
+{
+    int getgrnam_r(in char*, group*, char*, int, group**);
+    int getgrgid_r(gid_t, group*, char*, int, group**);
+}
 else version( Android )
 {
 }
@@ -144,6 +159,12 @@ else version( FreeBSD )
     @trusted void endgrent();
     @trusted void setgrent();
 }
+else version( Solaris )
+{
+    group* getgrent();
+    @trusted void endgrent();
+    @trusted void setgrent();
+}
 else version( Android )
 {
 }

src/core/sys/posix/unistd.d

@@ -136,7 +136,7 @@ else version( Solaris )
             off64_t lseek64(int, off64_t, int) @trusted;
             alias   lseek64 lseek;
 
-            int     ftruncate64(int, off64) @trusted;
+            int     ftruncate64(int, off64_t) @trusted;
             alias   ftruncate64 ftruncate;
         }
         else