Fix some MSVC 2017 errors

Thanks Dso Tsin!

src/clang_tu.cc

@@ -45,7 +45,8 @@ static Pos Decomposed2LineAndCol(const SourceManager &SM,
                                  std::pair<FileID, unsigned> I) {
   int l = SM.getLineNumber(I.first, I.second) - 1,
       c = SM.getColumnNumber(I.first, I.second) - 1;
-  return {(int16_t)std::min(l, INT16_MAX), (int16_t)std::min(c, INT16_MAX)};
+  return {(int16_t)std::min<int>(l, INT16_MAX),
+          (int16_t)std::min<int>(c, INT16_MAX)};
 }
 
 Range FromCharSourceRange(const SourceManager &SM, const LangOptions &LangOpts,

src/lsp.cc

@@ -18,6 +18,7 @@ limitations under the License.
 #include "log.hh"
 #include "serializers/json.hh"
 
+#include <algorithm>
 #include <stdio.h>
 
 namespace ccls {

src/position.cc

@@ -17,6 +17,7 @@ limitations under the License.
 
 #include "serializer.hh"
 
+#include <algorithm>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -57,14 +58,10 @@ Range Range::FromString(const std::string &encoded) {
 bool Range::Contains(int line, int column) const {
   if (line > INT16_MAX)
     return false;
-  Pos p{int16_t(line), int16_t(std::min(column, INT16_MAX))};
+  Pos p{(int16_t)line, (int16_t)std::min<int>(column, INT16_MAX)};
   return !(p < start) && p < end;
 }
 
-Range Range::RemovePrefix(Pos position) const {
-  return {std::min(std::max(position, start), end), end};
-}
-
 std::string Range::ToString() {
   char buf[99];
   snprintf(buf, sizeof buf, "%d:%d-%d:%d", start.line + 1, start.column + 1,

src/position.hh

@@ -52,7 +52,6 @@ struct Range {
 
   bool Valid() const { return start.Valid(); }
   bool Contains(int line, int column) const;
-  Range RemovePrefix(Pos position) const;
 
   std::string ToString();