Static lib handling for c-ares

Summary: Add shared_libs=off conditional section to the c-ares manifest to set CARES_SHARED=OFF when building static libraries.

Reviewed By: bigfootjon

Differential Revision: D93644422

fbshipit-source-id: 0193658db319ada9534b3cca4f439d93b4445681

Author: afrind

build/fbcode_builder/manifests/c-ares

@@ -11,3 +11,6 @@ subdir = c-ares-1.34.5
 
 [cmake.defines]
 CARES_STATIC = ON
+
+[cmake.defines.shared_libs=off]
+CARES_SHARED = OFF