winbuild: Make USE_WINSSL depend on USE_SSPI

Since WinSSL cannot be build without SSPI being enabled,
USE_WINSSL now defaults to the value of USE_SSPI.

The makefile does now raise an error if WinSSL is enabled
while SSPI is disabled.

winbuild/Makefile.vc

@@ -77,7 +77,7 @@ USE_IDN = false
 !ENDIF
 
 !IFNDEF ENABLE_WINSSL
-USE_WINSSL = true
+USE_WINSSL = $(USE_SSPI)
 !ELSEIF "$(ENABLE_WINSSL)"=="yes"
 USE_WINSSL = true
 !ELSEIF "$(ENABLE_WINSSL)"=="no"

winbuild/MakefileBuild.vc

@@ -143,22 +143,6 @@ SSH2_CFLAGS = $(SSH2_CFLAGS) /I$(WITH_DEVEL)/include/libssh2
 !ENDIF
 
 
-!IFNDEF USE_WINSSL
-!IF "$(USE_SSL)"=="true"
-USE_WINSSL  = false
-!ELSE
-USE_WINSSL  = true
-!ENDIF
-!ELSEIF "$(USE_WINSSL)"=="yes"
-USE_WINSSL  = true
-!ENDIF
-
-!IF "$(USE_WINSSL)"=="true"
-SSPI_CFLAGS = $(SSPI_CFLAGS) /DUSE_SCHANNEL
-USE_SSPI    = true
-!ENDIF
-
-
 !IFNDEF USE_SSPI
 USE_SSPI  = true
 !ELSEIF "$(USE_SSPI)"=="yes"
@@ -193,6 +177,24 @@ LFLAGS    = $(LFLAGS) Normaliz.lib
 !ENDIF
 
 
+!IFNDEF USE_WINSSL
+!IF "$(USE_SSL)"=="true"
+USE_WINSSL  = false
+!ELSE
+USE_WINSSL  = $(USE_SSPI)
+!ENDIF
+!ELSEIF "$(USE_WINSSL)"=="yes"
+USE_WINSSL  = true
+!ENDIF
+
+!IF "$(USE_WINSSL)"=="true"
+!IF "$(USE_SSPI)"!="true"
+!ERROR cannot build with WinSSL without SSPI
+!ENDIF
+SSPI_CFLAGS = $(SSPI_CFLAGS) /DUSE_SCHANNEL
+!ENDIF
+
+
 
 !IF "$(GEN_PDB)"=="yes"
 GEN_PDB = true