MDEV-5152 mysql_config includes -lprobes_mysql but mo such library installed

when converting /a/full/path/to/a/file.ext to -lfile ignore all files
with non-library extenstions.

scripts/CMakeLists.txt

@@ -270,10 +270,12 @@ MACRO(EXTRACT_LINK_LIBRARIES target var)
         IF (lib MATCHES "^\\-l")
           SET(${var} "${${var}} ${lib} ") 
         ELSEIF(lib MATCHES "^/")
-          # Full path, convert to just filename, strip "lib" prefix and extension
-          GET_FILENAME_COMPONENT(lib "${lib}" NAME_WE)
-          STRING(REGEX REPLACE "^lib" "" lib "${lib}")
-          SET(${var} "${${var}}-l${lib} " ) 
+          IF (lib MATCHES "\\.(a|so([0-9.]*)|lib|dll|dylib)$")
+            # Full path, convert to just filename, strip "lib" prefix and extension
+            GET_FILENAME_COMPONENT(lib "${lib}" NAME_WE)
+            STRING(REGEX REPLACE "^lib" "" lib "${lib}")
+            SET(${var} "${${var}}-l${lib} " ) 
+          ENDIF()
         ELSE()
           SET(${var} "${${var}}-l${lib} " ) 
         ENDIF()