[libc] Add bazel definition for hypot/hypotf.

Patch by Clint Caywood.

Differential Revision: https://reviews.llvm.org/D118053

Author: cratonica

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -75,6 +75,7 @@ fputil_common_hdrs = [
     "src/__support/FPUtil/FEnvUtils.h",
     "src/__support/FPUtil/FPBits.h",
     "src/__support/FPUtil/FloatProperties.h",
+    "src/__support/FPUtil/Hypot.h",
     "src/__support/FPUtil/ManipulationFunctions.h",
     "src/__support/FPUtil/NearestIntegerOperations.h",
     "src/__support/FPUtil/NormalFloat.h",
@@ -371,6 +372,10 @@ libc_math_function(name = "frexpf")
 
 libc_math_function(name = "frexpl")
 
+libc_math_function(name = "hypot")
+
+libc_math_function(name = "hypotf")
+
 libc_math_function(name = "logb")
 
 libc_math_function(name = "logbf")