Correct check for WIN32 in cmake files for programs

Condition was checking for Visual Studio, not use of WIN32

Signed-off-by: Simon Butcher <simon.butcher@arm.com>

programs/pkey/CMakeLists.txt

@@ -1,6 +1,10 @@
-if(MSVC)
+set(libs
+    mbedtls
+)
+
+if(WIN32)
     set(libs ${libs} bcrypt)
-endif()
+endif(WIN32)
 
 set(executables_mbedtls
     dh_client

programs/random/CMakeLists.txt

@@ -1,6 +1,10 @@
-if(MSVC)
+set(libs
+    mbedtls
+)
+
+if(WIN32)
     set(libs ${libs} bcrypt)
-endif()
+endif(WIN32)
 
 set(executables
     gen_entropy

programs/ssl/CMakeLists.txt

@@ -5,9 +5,9 @@ set(libs
     ${mbedtls_target}
 )
 
-if(MSVC)
+if(WIN32)
     set(libs ${libs} bcrypt)
-endif()
+endif(WIN32)
 
 set(executables
     dtls_client

programs/test/CMakeLists.txt

@@ -2,9 +2,9 @@ set(libs
     ${mbedtls_target}
 )
 
-if(MSVC)
+if(WIN32)
     set(libs ${libs} bcrypt)
-endif()
+endif(WIN32)
 
 set(executables_libs
     query_included_headers

programs/x509/CMakeLists.txt

@@ -1,9 +1,10 @@
 set(libs
     ${mbedx509_target}
 )
-if(MSVC)
+
+if(WIN32)
     set(libs ${libs} bcrypt)
-endif()
+endif(WIN32)
 
 set(executables
     cert_app