package/llvm-project/clang: update patch to be applied with fuzz 0

Commit 8f88a64 "support/scripts/apply-patches.sh: set the maximum
fuzz factor to 0" reduced the fuzz factor.

Due to this change, host-clang fails to build with output:

Applying 0001-lib-Driver-ToolChains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch using patch:
patching file lib/Driver/ToolChains/Gnu.cpp
Hunk #1 FAILED at 1725.
Hunk #2 succeeded at 2011 (offset 277 lines).
1 out of 2 hunks FAILED -- saving rejects to file lib/Driver/ToolChains/Gnu.cpp.rej

Rebase the patch to fix the problem.

Fixes:
http://autobuild.buildroot.net/results/75b/75baa62275d64c699d9757f7c756fc03ea717877/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

Author: bkuhls

package/llvm-project/clang/0001-lib-Driver-ToolChains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch

@@ -44,7 +44,7 @@ index 2ad45097dc..90d6b5b748 100644
 +++ b/lib/Driver/ToolChains/Gnu.cpp
 @@ -1725,6 +1725,8 @@ void Generic_GCC::GCCInstallationDetector::init(
 
-     Prefixes.push_back(GCCToolchainDir);
+     Prefixes.push_back(std::string(GCCToolchainDir));
    } else {
 +    StringRef GccIinstallPrefix = GCC_INSTALL_PREFIX;
 +