Change build-llvm.py and build-lldb-llvm-clang's patching mechanisms to
assume git-style diffs.  Committing for Francis Ricci.

Differential Revision: https://reviews.llvm.org/D38328

llvm-svn: 314366
diff --git a/lldb/scripts/build-lldb-llvm-clang b/lldb/scripts/build-lldb-llvm-clang
index 822e994..c71188d 100755
--- a/lldb/scripts/build-lldb-llvm-clang
+++ b/lldb/scripts/build-lldb-llvm-clang
@@ -33,7 +33,7 @@
 for patch_file in ../scripts/llvm.*.diff
 do
 	echo "Applying patch from '$patch_file'"
-    patch -p0 < "$patch_file"
+    patch -p1 < "$patch_file"
 done
 
 # change directory to "./llvm/tools/clang"
@@ -41,7 +41,7 @@
 for patch_file in ../../../scripts/clang.*.diff
 do
 	echo "Applying patch from '$patch_file'"
-    patch -p0 < "$patch_file"
+    patch -p1 < "$patch_file"
 done
 
 # change directory to "./"