Have Cocoapods rename includes in the core wrapper

Fixes https://github.com/grpc/grpc/issues/2194 .

gRPC.podspec

@@ -82,7 +82,7 @@ Pod::Spec.new do |s|
     DIR_TIME="grpc/support"
     BAD_TIME="$DIR_TIME/time.h"
     GOOD_TIME="$DIR_TIME/grpc_time.h"
-    grep -rl "$BAD_TIME" grpc src/core | xargs sed -i '' -e s@$BAD_TIME@$GOOD_TIME@g
+    grep -rl "$BAD_TIME" grpc src/core src/objective-c/GRPCClient | xargs sed -i '' -e s@$BAD_TIME@$GOOD_TIME@g
     if [ -f "include/$BAD_TIME" ];
     then
       mv -f "include/$BAD_TIME" "include/$GOOD_TIME"
@@ -91,7 +91,7 @@ Pod::Spec.new do |s|
     DIR_STRING="src/core/support"
     BAD_STRING="$DIR_STRING/string.h"
     GOOD_STRING="$DIR_STRING/grpc_string.h"
-    grep -rl "$BAD_STRING" grpc src/core | xargs sed -i '' -e s@$BAD_STRING@$GOOD_STRING@g
+    grep -rl "$BAD_STRING" grpc src/core src/objective-c/GRPCClient | xargs sed -i '' -e s@$BAD_STRING@$GOOD_STRING@g
     if [ -f "$BAD_STRING" ];
     then
       mv -f "$BAD_STRING" "$GOOD_STRING"

src/objective-c/GRPCClient/GRPCCall.m

@@ -34,7 +34,7 @@
 #import "GRPCCall.h"
 
 #include <grpc/grpc.h>
-#include <grpc/support/grpc_time.h>
+#include <grpc/support/time.h>
 
 #import "GRPCMethodName.h"
 #import "private/GRPCChannel.h"

templates/gRPC.podspec.template

@@ -113,7 +113,7 @@ Pod::Spec.new do |s|
     DIR_TIME="grpc/support"
     BAD_TIME="$DIR_TIME/time.h"
     GOOD_TIME="$DIR_TIME/grpc_time.h"
-    grep -rl "$BAD_TIME" grpc src/core | xargs sed -i '' -e s@$BAD_TIME@$GOOD_TIME@g
+    grep -rl "$BAD_TIME" grpc src/core src/objective-c/GRPCClient | xargs sed -i '' -e s@$BAD_TIME@$GOOD_TIME@g
     if [ -f "include/$BAD_TIME" ];
     then
       mv -f "include/$BAD_TIME" "include/$GOOD_TIME"
@@ -122,7 +122,7 @@ Pod::Spec.new do |s|
     DIR_STRING="src/core/support"
     BAD_STRING="$DIR_STRING/string.h"
     GOOD_STRING="$DIR_STRING/grpc_string.h"
-    grep -rl "$BAD_STRING" grpc src/core | xargs sed -i '' -e s@$BAD_STRING@$GOOD_STRING@g
+    grep -rl "$BAD_STRING" grpc src/core src/objective-c/GRPCClient | xargs sed -i '' -e s@$BAD_STRING@$GOOD_STRING@g
     if [ -f "$BAD_STRING" ];
     then
       mv -f "$BAD_STRING" "$GOOD_STRING"