Remove unintended defines from config.h

PiperOrigin-RevId: 453429588
Change-Id: Id377cd89dc807da80a33a8549f4e59bd935aff93

absl/base/config.h

diff --git a/absl/base/config.h b/absl/base/config.h
index 802529f..cf940f3 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -183,12 +183,6 @@
 #define ABSL_HAVE_BUILTIN(x) 0
 #endif
 
-#if defined(__is_identifier)
-#define ABSL_INTERNAL_HAS_KEYWORD(x) !(__is_identifier(x))
-#else
-#define ABSL_INTERNAL_HAS_KEYWORD(x) 0
-#endif
-
 #ifdef __has_feature
 #define ABSL_HAVE_FEATURE(f) __has_feature(f)
 #else
@@ -260,21 +254,6 @@
 #define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
 #endif
 
-// ABSL_HAVE_SOURCE_LOCATION_CURRENT
-//
-// Indicates whether `absl::SourceLocation::current()` will return useful
-// information in some contexts.
-#ifndef ABSL_HAVE_SOURCE_LOCATION_CURRENT
-#if ABSL_INTERNAL_HAS_KEYWORD(__builtin_LINE) && \
-    ABSL_INTERNAL_HAS_KEYWORD(__builtin_FILE)
-#define ABSL_HAVE_SOURCE_LOCATION_CURRENT 1
-#elif ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(5, 0)
-#define ABSL_HAVE_SOURCE_LOCATION_CURRENT 1
-#elif defined(_MSC_VER) && _MSC_VER >= 1926
-#define ABSL_HAVE_SOURCE_LOCATION_CURRENT 1
-#endif
-#endif
-
 // ABSL_HAVE_THREAD_LOCAL
 //
 // Checks whether C++11's `thread_local` storage duration specifier is
@@ -729,8 +708,6 @@
 #endif
 #endif
 
-#undef ABSL_INTERNAL_HAS_KEYWORD
-
 // ABSL_DLL
 //
 // When building Abseil as a DLL, this macro expands to `__declspec(dllexport)`