Accepting request 841058 from home:badshah400:branches:devel:tools

(Fixes for libdir path flagged in sr#838414)
- Specify gRPC_INSTALL_LIBDIR and gRPC_INSTALL_CMAKEDIR to correctly configure install paths for libraries and cmake files instead of moving them after the installation.
- Add grpc-correct-pkgconfig-path.patch to fix install path for pkgconfig file relative to gRPC_INSTALL_LIBDIR.
- Add Requires: pkgconfig(libcares) for the -devel pkg.

OBS-URL: https://build.opensuse.org/request/show/841058
OBS-URL: https://build.opensuse.org/package/show/devel:tools/grpc?expand=0&rev=68

grpc-correct-pkgconfig-path.patch

@@ -0,0 +1,13 @@
+Index: grpc-1.32.0/CMakeLists.txt
+===================================================================
+--- grpc-1.32.0.orig/CMakeLists.txt
++++ grpc-1.32.0/CMakeLists.txt
+@@ -15667,7 +15667,7 @@ function(generate_pkgconfig name descrip
+     "${output_filepath}"
+     @ONLY)
+   install(FILES "${output_filepath}"
+-    DESTINATION "lib/pkgconfig/")
++    DESTINATION "${gRPC_INSTALL_LIBDIR}/pkgconfig/")
+ endfunction()
+ 
+ # gpr .pc file