[CMake] Fix missing RegexParser dependency

RegexBuilder depends on RegexParser. Without the link dependency, we the
swift module isn't passed to the RegexBuilder build.

Author: etcwilde

Runtimes/Supplemental/StringProcessing/RegexBuilder/CMakeLists.txt

@@ -10,5 +10,6 @@ set_target_properties(swiftRegexBuilder PROPERTIES
   Swift_MODULE_NAME RegexBuilder)
 
 target_link_libraries(swiftRegexBuilder PRIVATE
+  swift_RegexParser
   swift_StringProcessing
   swiftCore)