Fix windows C++ build

Author: texodus

cpp/perspective/src/cpp/storage_impl_linux.cpp

@@ -84,7 +84,7 @@ t_lstore::create_file() {
 }
 
 void*
-t_lstore::create_mapping() const {
+t_lstore::create_mapping() {
     void* rval = mmap(0, capacity(), m_mprot, m_mflags, m_fd, 0);
     PSP_VERBOSE_ASSERT(rval != MAP_FAILED, "mmap failed");
     return rval;

cpp/perspective/src/cpp/storage_impl_osx.cpp

@@ -84,7 +84,7 @@ t_lstore::create_file() {
 }
 
 void*
-t_lstore::create_mapping() const {
+t_lstore::create_mapping() {
     void* rval = mmap(nullptr, capacity(), m_mprot, m_mflags, m_fd, 0);
     PSP_VERBOSE_ASSERT(rval, != MAP_FAILED, "mmap failed");
     return rval;

cpp/perspective/src/cpp/storage_impl_win.cpp

@@ -93,7 +93,7 @@ t_lstore::create_file() {
 }
 
 void*
-t_lstore::create_mapping() const {
+t_lstore::create_mapping() {
     std::pair<std::uint32_t, std::uint32_t> capacity = capacity_pair();
 
     m_winmapping_handle = CreateFileMapping(

cpp/perspective/src/include/perspective/storage.h

@@ -240,7 +240,7 @@ class PERSPECTIVE_MPROTECT_EXPORT t_lstore : public t_debug_helper
 private:
     void reserve_impl(t_uindex capacity, bool allow_shrink);
     t_handle create_file();
-    void* create_mapping() const;
+    void* create_mapping();
     void resize_mapping(t_uindex cap_new);
     void destroy_mapping();