Fix LLVM_VERSION_MAJOR for LLVM 10 on macOS

Looks like I generated the configs using ToT which had already bumped version, insteaad of the snapshot held by SwiftShader `third_party/llvm-10.0`

Bug: b/152339534
Change-Id: I7d01a3c8d308916c6fa699ba73f0b3201fdf1658
diff --git a/third_party/llvm-10.0/configs/darwin/include/llvm/Config/llvm-config.h b/third_party/llvm-10.0/configs/darwin/include/llvm/Config/llvm-config.h
index 3bef488..527cb0c 100644
--- a/third_party/llvm-10.0/configs/darwin/include/llvm/Config/llvm-config.h
+++ b/third_party/llvm-10.0/configs/darwin/include/llvm/Config/llvm-config.h
@@ -63,7 +63,7 @@
 #define LLVM_USE_PERF 0
 
 /* Major version of the LLVM API */
-#define LLVM_VERSION_MAJOR 11
+#define LLVM_VERSION_MAJOR 10
 
 /* Minor version of the LLVM API */
 #define LLVM_VERSION_MINOR 0