UseSWIG: Fix check for noproxy flag (#14990)

The check for this flag added by commit v3.0.0-rc1~284^2 (UseSWIG: Name
python module according to swig flags, 2013-11-26) can get false
positives on flags like "-noproxydel".  Improve the check to match only
"-noproxy".

Suggested-by: Garth Wells <[email protected]>

Modules/UseSWIG.cmake

@@ -57,7 +57,7 @@ macro(SWIG_MODULE_INITIALIZE name language)
   set(SWIG_MODULE_${name}_SWIG_LANGUAGE_FLAG "${swig_lowercase_language}")
 
   set(SWIG_MODULE_${name}_REAL_NAME "${name}")
-  if (CMAKE_SWIG_FLAGS MATCHES "-noproxy")
+  if (";${CMAKE_SWIG_FLAGS};" MATCHES ";-noproxy;")
     set (SWIG_MODULE_${name}_NOPROXY TRUE)
   endif ()
   if("${SWIG_MODULE_${name}_LANGUAGE}" STREQUAL "UNKNOWN")