Fix build with latest visual studio (2019)

Author: nijtmans

bn_s_mp_rand_platform.c

@@ -27,16 +27,9 @@ static mp_err s_read_arc4random(void *p, size_t n)
 #define ARM
 #endif
 
-#ifdef _MSC_VER
-# pragma warning(push)
-# pragma warning (disable : 4668)
-#endif
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <wincrypt.h>
-#ifdef _MSC_VER
-# pragma warning(pop)
-#endif
 
 static mp_err s_read_wincsp(void *p, size_t n)
 {

makefile.msvc

@@ -14,7 +14,7 @@ PREFIX    = c:\devel
 CFLAGS    = /Ox
 
 #Compilation flags
-LTM_CFLAGS  = /nologo /I./ /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_DEPRECATE /D__STDC_WANT_SECURE_LIB__=1 /D_CRT_HAS_CXX17=0 /Wall /wd4146 /wd4127 /wd4710 /wd4711 /wd4820 /WX $(CFLAGS)
+LTM_CFLAGS  = /nologo /I./ /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_DEPRECATE /D__STDC_WANT_SECURE_LIB__=1 /D_CRT_HAS_CXX17=0 /Wall /wd4146 /wd4127 /wd4668 /wd4710 /wd4711 /wd4820 /wd5045 /WX $(CFLAGS)
 LTM_LDFLAGS = advapi32.lib
 
 #Libraries to be created (this makefile builds only static libraries)