ICU-22548 Reduce the loop limit to fail faster

Reduce the error return from about 100s to 30s to avoid
fuzzer 60s timeout error.
Also add a include file to fix uint8_t build breakage.

icu4c/source/i18n/collationbuilder.cpp

@@ -1119,9 +1119,9 @@ CollationBuilder::addWithClosure(const UnicodeString &nfdPrefix, const UnicodeSt
 // Please let us know if you have a reasonable use case that needed
 // for a practical Collation rule that needs to increase this limit.
 // This value is needed for compiling a rule with eight Hangul syllables such as
-// "&a=b쫊쫊쫊쫊쫊쫊쫊쫊" without error, which should be more than realistic
+// "&a=b쫊쫊쫊쫊쫊쫊쫊" without error, which should be more than realistic
 // usage.
-static constexpr int32_t kClosureLoopLimit = 6560;
+static constexpr int32_t kClosureLoopLimit = 3000;
 
 uint32_t
 CollationBuilder::addOnlyClosure(const UnicodeString &nfdPrefix, const UnicodeString &nfdString,

icu4c/source/test/fuzzer/locale_util.h

@@ -5,6 +5,7 @@
 #define I18N_ICU_FUZZ_LOCALE_UTIL_H_
 
 #include <string>
+#include "unicode/utypes.h"
 
 // Takes uint8_t data from fuzzer, and makes a zero terminated string.
 std::string MakeZeroTerminatedInput(const uint8_t* data, int32_t size);