Import Solaris support (#741)

This commit adds support for Solaris, squashed from PR #741:

Summary of additions:

* Initial setup of Solaris platform directory
* Add Solaris platform into autoconf template
* Uptime and load averages
* Add dependency on libkstat
* Basic process listing
* Zone name display
* CPU detection
* Per-process memory and CPU usage parsed correctly
* Uses sysconf to discover number of CPUs, instead of more complex libkstat code
* Simple memory display working
* Reduce repetitive calls to the PAGE_SIZE macro when reading memory info
* Add Project, Contract, Task, and Pool into process properties
* Use system major()/minor() implementations and remove extraneous definition of mkdev()
* Get the STARTTIME column working properly, using the Linux implementation as a guide

solaris/Platform.h

@@ -0,0 +1,53 @@
+/* Do not edit this file. It was automatically generated. */
+
+#ifndef HEADER_Platform
+#define HEADER_Platform
+/*
+htop - solaris/Platform.h
+(C) 2014 Hisham H. Muhammad
+(C) 2015 David C. Hunt
+(C) 2017 Guy M. Broome
+Released under the GNU GPL, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "Action.h"
+#include "BatteryMeter.h"
+#include "SignalsPanel.h"
+#include <sys/mkdev.h>
+
+extern ProcessFieldData Process_fields[];
+typedef struct var kvar_t;
+
+
+extern double plat_loadavg[3];
+
+extern const SignalItem Platform_signals[];
+
+extern const unsigned int Platform_numberOfSignals;
+
+extern ProcessField Platform_defaultFields[];
+
+extern MeterClass* Platform_meterTypes[];
+
+void Platform_setBindings(Htop_Action* keys);
+
+extern int Platform_numberOfFields;
+
+extern char Process_pidFormat[20];
+
+int Platform_getUptime();
+
+void Platform_getLoadAverage(double* one, double* five, double* fifteen);
+
+int Platform_getMaxPid();
+
+double Platform_setCPUValues(Meter* this, int cpu);
+
+void Platform_setMemoryValues(Meter* this);
+
+void Platform_setSwapValues(Meter* this);
+
+char* Platform_getProcessEnv(pid_t pid);
+
+#endif