Prevent people on platforms that arent 'windows' from being able to build with msvc

compiler/main.v

@@ -210,6 +210,11 @@ fn main() {
 }
 
 fn (v mut V) compile() {
+	// Emily: Stop people on linux from being able to build with msvc
+	if os.user_os() != 'windows' && v.os == .msvc {
+		panic('Cannot build with msvc on ${os.user_os()}')
+	}
+
 	mut cgen := v.cgen
 	cgen.genln('// Generated by V')
 	v.add_v_files_to_compile()
@@ -753,7 +758,8 @@ fn (v mut V) cc() {
 			v.cc_msvc() 
 			return
 		}
-	} 
+	}
+	
 	linux_host := os.user_os() == 'linux'
 	v.log('cc() isprod=$v.pref.is_prod outname=$v.out_name')
 	mut a := [v.pref.cflags, '-std=gnu11', '-w'] // arguments for the C compiler