Allow build on HP-UX 11.X

Patch from Richard Lloyd (slightly edited from me), following the list
of changes as described by the author:

src/Makefile:
- Added PREFIX and BINDIR for the install: rule.
- Added a "make hpux" line to the help: rule.
- Added "make test"/"make check" rule that runs the $(PGOBENCH) command.
- "make clean" now additionally removes core and bench.txt.
- Added an hpux: rule.
- Added an install: rule to mkdir $(BINDIR), copy $(EXE) to $(BINDIR) and
 then strip it.
- "make strip" now ensures that $(EXE) is built first before trying to
 strip it.
- Hide errors and output from the g++ command used by the .depend: rule and
 then touch .depend in case g++ isn't available.
- Hide errors from the "include .depend" in case .depend doesn't exist
 (e.g. directly after a "make clean").

src/book.cpp and src/book.h:
- HP-UX's aCC really didn't like the const keywords used for the
 Book::file_name() definitions, so they were removed. I checked that this
 didn't affect a Linux build and it was still fine.

src/misc.cpp:
- HP-UX uses <sys/pstat.h> and pstat_getdynamic() to determine the number of
 CPU cores, so added conditional code for that (if pstat_getdynamic() fails,
 set the number of cores to 1).

src/tt.cpp:
- <xmmintrin.h> and _mm_prefetch() seem highly specific to the Intel x86(_64)
 and gcc platforms - neither exist in HP-UX, so conditionally avoid that
 code in HP-UX's case. Perhaps some sort of define is needed here
 such as -DHAS_MM_PREFETCH that could be #ifdef'ed for instead?

Even after these changes, it's more convenient for HP-UX users to edit the
default: rule in the Makefile to run "$(MAKE) hpux" before they build
stockfish, but that's not a big deal if they're warned about that first (the
same applies to all other builds other than the standard "$(MAKE) gcc" one).

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/Makefile

@@ -21,6 +21,10 @@
 ### Executable name. Do not change
 EXE = stockfish
 
+### Installation dir definitions
+PREFIX = /usr/local
+BINDIR = $(PREFIX)/bin
+
 
 ### ==========================================================================
 ### Compiler speed switches for both GCC and ICC. These settings are generally
@@ -92,14 +96,18 @@ help:
 	@echo "make osx-icc64      >  x86-Mac OS X 64 bit. Compiler = icpc"
 	@echo "make osx-icc32-profile > OSX 32 bit. Compiler = icpc + automatic pgo-build"
 	@echo "make osx-icc64-profile > OSX 64 bit. Compiler = icpc + automatic pgo-build"
+	@echo "make hpux           >  HP-UX. Compiler = aCC"
 	@echo "make strip          >  Strip executable"
 	@echo "make clean          >  Clean up"
 	@echo ""
 
 all: $(EXE) .depend
 
+test check: default
+	@$(PGOBENCH)
+
 clean:
-	$(RM) *.o .depend *~ $(EXE)
+	$(RM) *.o .depend *~ $(EXE) core bench.txt
 
 
 ### Possible targets. You may add your own ones here
@@ -296,6 +304,12 @@ osx-icc64-profile:
 	$(MAKE) osx-icc64-profile-use
 	@rm -rf profdir bench.txt
 
+hpux:
+	$(MAKE) \
+	CXX='/opt/aCC/bin/aCC -AA +hpxstd98 -DBIGENDIAN -mt +O3 -DNDEBUG' \
+	CXXFLAGS="" \
+	LDFLAGS="" \
+	all
 
 
 strip:
@@ -306,9 +320,14 @@ strip:
 $(EXE): $(OBJS)
 	$(CXX) $(LDFLAGS) -o $@ $(OBJS)
 
+### Installation
+install: default
+	-mkdir -p -m 755 $(BINDIR)
+	-cp $(EXE) $(BINDIR)
+	-strip $(BINDIR)/$(EXE)
 
 ### Dependencies. Do not change
 .depend:
-	$(CXX) -msse -MM $(OBJS:.o=.cpp) > $@
+	-@$(CXX) -msse -MM $(OBJS:.o=.cpp) > $@ 2> /dev/null
 
 include .depend