tests: ztest: zexpect: include source file directly in main.cpp

The main.cpp was introduced as a symbolic link of main.c
but this makes the test build failure on Windows, so just
remove the symlink and include directly the source

Signed-off-by: Dat Nguyen Duy <dat.nguyenduy@nxp.com>

tests/ztest/zexpect/CMakeLists.txt

@@ -15,7 +15,5 @@ else()
     target_sources(app PRIVATE src/main.cpp)
   else()
     target_sources(app PRIVATE src/main.c)
-
-    target_sources_ifdef(CONFIG_USERSPACE app PRIVATE src/main_userspace.c)
   endif()
 endif()

tests/ztest/zexpect/src/main.cpp

@@ -1 +0,0 @@
-main.c

tests/ztest/zexpect/src/main.cpp

@@ -0,0 +1 @@
+#include "main.c"