Fix undefined macro issue in locale tests

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@329148 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp

@@ -110,7 +110,10 @@ int main()
         assert(f.decimal_point() == L',');
     }
 // GLIBC 2.23 uses '.' as the decimal point while other C libraries use ','
-// GLIBC 2.27 corrects this.
+// GLIBC 2.27 corrects this
+#ifndef TEST_GLIBC_PREREQ
+#define TEST_GLIBC_PREREQ(x, y) 0
+#endif
 #if !defined(TEST_HAS_GLIBC) || TEST_GLIBC_PREREQ(2, 27)
     const char sep = ',';
     const wchar_t wsep = L',';

test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/thousands_sep.pass.cpp

@@ -118,6 +118,9 @@ int main()
 // and U002E as mon_decimal_point.
 // TODO: Fix thousands_sep for 'char'.
 // related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16006
+#ifndef TEST_GLIBC_PREREQ
+#define TEST_GLIBC_PREREQ(x, y) 0
+#endif
 #ifndef TEST_HAS_GLIBC
     const char sep = ' ';
     const wchar_t wsep = L' ';