[Clang] Drop Shell Requirements (#165149)

These are basically synonymous with marking windows as an unsupported
platform at this point and should be removed in favor of such
annotations. Removing the remianing annotations which should further
unblock removing the feature altogether now that everything minus
compiler-rt is using the internal shell by default. These were missed
when making the tests compatible with the internal shell.

clang/test/ClangScanDeps/resource_directory.c

diff --git a/clang/test/ClangScanDeps/resource_directory.c b/clang/test/ClangScanDeps/resource_directory.c
index 6183e8a..5c4b24f 100644
--- a/clang/test/ClangScanDeps/resource_directory.c
+++ b/clang/test/ClangScanDeps/resource_directory.c
@@ -1,4 +1,5 @@
-// REQUIRES: shell
+// Path seperator differences
+// UNSUPPORTED: system-windows
 
 // RUN: rm -rf %t && mkdir %t
 // RUN: cp %S/Inputs/resource_directory/* %t

clang/test/Driver/baremetal-multilib-custom-error.yaml

diff --git a/clang/test/Driver/baremetal-multilib-custom-error.yaml b/clang/test/Driver/baremetal-multilib-custom-error.yaml
index 0be92e2..bc06ed4 100644
--- a/clang/test/Driver/baremetal-multilib-custom-error.yaml
+++ b/clang/test/Driver/baremetal-multilib-custom-error.yaml
@@ -1,4 +1,3 @@
-# REQUIRES: shell
 # UNSUPPORTED: system-windows
 
 # RUN: %clang --multi-lib-config=%s -no-canonical-prefixes -print-multi-directory 2>&1 \

clang/test/Frontend/absolute-paths-symlinks.c

diff --git a/clang/test/Frontend/absolute-paths-symlinks.c b/clang/test/Frontend/absolute-paths-symlinks.c
index 8170910..80bca34 100644
--- a/clang/test/Frontend/absolute-paths-symlinks.c
+++ b/clang/test/Frontend/absolute-paths-symlinks.c
@@ -12,6 +12,5 @@
 // CHECK-SAME: error: unknown type name
 This do not compile
 
-// REQUIRES: shell
 // Don't make symlinks on Windows.
 // UNSUPPORTED: system-windows

clang/test/Tooling/clang-check-pwd.cpp

diff --git a/clang/test/Tooling/clang-check-pwd.cpp b/clang/test/Tooling/clang-check-pwd.cpp
index 309cee5..e4360c0 100644
--- a/clang/test/Tooling/clang-check-pwd.cpp
+++ b/clang/test/Tooling/clang-check-pwd.cpp
@@ -12,5 +12,3 @@
 // CHECK: a type specifier is required
 // CHECK: .foobar/test.cpp
 invalid;
-
-// REQUIRES: shell