gdb: Use std::min and std::max throughout

Otherwise including <string> or some other C++ header is broken.
E.g.:

  In file included from /opt/gcc/include/c++/7.0.0/bits/char_traits.h:39:0,
		   from /opt/gcc/include/c++/7.0.0/string:40,
		   from /home/pedro/gdb/mygit/cxx-convertion/src/gdb/infrun.c:68:
  /opt/gcc/include/c++/7.0.0/bits/stl_algobase.h:243:56: error: macro "min" passed 3 arguments, but takes just 2
       min(const _Tp& __a, const _Tp& __b, _Compare __comp)
							  ^
  /opt/gcc/include/c++/7.0.0/bits/stl_algobase.h:265:56: error: macro "max" passed 3 arguments, but takes just 2
       max(const _Tp& __a, const _Tp& __b, _Compare __comp)
							  ^
  In file included from .../src/gdb/infrun.c:21:0:

To the best of my grepping abilities, I believe I adjusted all min/max
calls.

gdb/ChangeLog:
2016-09-16  Pedro Alves  <palves@redhat.com>

	* defs.h (min, max): Delete.
	* aarch64-tdep.c: Include <algorithm> and use std::min and
	std::max throughout.
	* aarch64-tdep.c: Likewise.
	* alpha-tdep.c: Likewise.
	* amd64-tdep.c: Likewise.
	* amd64-windows-tdep.c: Likewise.
	* arm-tdep.c: Likewise.
	* avr-tdep.c: Likewise.
	* breakpoint.c: Likewise.
	* btrace.c: Likewise.
	* ctf.c: Likewise.
	* disasm.c: Likewise.
	* doublest.c: Likewise.
	* dwarf2loc.c: Likewise.
	* dwarf2read.c: Likewise.
	* environ.c: Likewise.
	* exec.c: Likewise.
	* f-exp.y: Likewise.
	* findcmd.c: Likewise.
	* ft32-tdep.c: Likewise.
	* gcore.c: Likewise.
	* hppa-tdep.c: Likewise.
	* i386-darwin-tdep.c: Likewise.
	* i386-tdep.c: Likewise.
	* linux-thread-db.c: Likewise.
	* lm32-tdep.c: Likewise.
	* m32r-tdep.c: Likewise.
	* m88k-tdep.c: Likewise.
	* memrange.c: Likewise.
	* minidebug.c: Likewise.
	* mips-tdep.c: Likewise.
	* moxie-tdep.c: Likewise.
	* nds32-tdep.c: Likewise.
	* nios2-tdep.c: Likewise.
	* nto-procfs.c: Likewise.
	* parse.c: Likewise.
	* ppc-sysv-tdep.c: Likewise.
	* probe.c: Likewise.
	* record-btrace.c: Likewise.
	* remote.c: Likewise.
	* rs6000-tdep.c: Likewise.
	* rx-tdep.c: Likewise.
	* s390-linux-nat.c: Likewise.
	* s390-linux-tdep.c: Likewise.
	* ser-tcp.c: Likewise.
	* sh-tdep.c: Likewise.
	* sh64-tdep.c: Likewise.
	* source.c: Likewise.
	* sparc-tdep.c: Likewise.
	* symfile.c: Likewise.
	* target-memory.c: Likewise.
	* target.c: Likewise.
	* tic6x-tdep.c: Likewise.
	* tilegx-tdep.c: Likewise.
	* tracefile-tfile.c: Likewise.
	* tracepoint.c: Likewise.
	* valprint.c: Likewise.
	* value.c: Likewise.
	* xtensa-tdep.c: Likewise.
	* cli/cli-cmds.c: Likewise.
	* compile/compile-object-load.c: Likewise.

gdb/cli/cli-cmds.c

@@ -56,6 +56,7 @@
 #endif
 
 #include <fcntl.h>
+#include <algorithm>
 
 /* Prototypes for local command functions */
 
@@ -918,7 +919,7 @@ list_command (char *arg, int from_tty)
 	{
 	  int first;
 
-	  first = max (cursal.line - get_lines_to_list () / 2, 1);
+	  first = std::max (cursal.line - get_lines_to_list () / 2, 1);
 
 	  /* A small special case --- if listing backwards, and we
 	     should list only one line, list the preceding line,
@@ -945,8 +946,8 @@ list_command (char *arg, int from_tty)
 	    error (_("Already at the start of %s."),
 		   symtab_to_filename_for_display (cursal.symtab));
 	  print_source_lines (cursal.symtab,
-			      max (get_first_line_listed ()
-				   - get_lines_to_list (), 1),
+			      std::max (get_first_line_listed ()
+					- get_lines_to_list (), 1),
 			      get_first_line_listed (), 0);
 	}
 
@@ -1090,7 +1091,7 @@ list_command (char *arg, int from_tty)
     error (_("No default source file yet.  Do \"help list\"."));
   if (dummy_beg)
     print_source_lines (sal_end.symtab,
-			max (sal_end.line - (get_lines_to_list () - 1), 1),
+			std::max (sal_end.line - (get_lines_to_list () - 1), 1),
 			sal_end.line + 1, 0);
   else if (sal.symtab == 0)
     error (_("No default source file yet.  Do \"help list\"."));