gnu: Remove unused patch.

This is a follow-up to commit 2c4acd05d4.

* gnu/packages/patches/clang-3.8-libc-search-path.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Unregister file.

Change-Id: I402f01f1fa442f71b3a0b8c67faa38ae76ac8d6e

gnu/local.mk

@@ -1089,7 +1089,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/cl-asdf-config-directories.patch		\
   %D%/packages/patches/clamav-config-llvm-libs.patch		\
   %D%/packages/patches/clamav-system-tomsfastmath.patch		\
-  %D%/packages/patches/clang-3.8-libc-search-path.patch		\
   %D%/packages/patches/clang-11.0-libc-search-path.patch	\
   %D%/packages/patches/clang-12.0-libc-search-path.patch	\
   %D%/packages/patches/clang-13.0-libc-search-path.patch	\

gnu/packages/patches/clang-3.8-libc-search-path.patch

@@ -1,69 +0,0 @@
-Clang attempts to guess file names based on the OS and distro (yes!),
-but unfortunately, that doesn't work for us.
-
-This patch makes it easy to insert libc's $libdir so that Clang passes the
-correct absolute file name of crt1.o etc. to 'ld'.  It also disables all
-the distro-specific stuff and removes the hard-coded FHS directory names
-to make sure Clang also works on non-GuixSD systems.
-
-This patch makes slight adjustments over "clang-libc-search-path.patch" for
-changes in clang 3.8.
-
---- cfe-3.8.0.src/lib/Driver/ToolChains.cpp
-+++ cfe-3.8.0.src/lib/Driver/ToolChains.cpp
-@@ -3661,6 +3661,9 @@
-                          GCCInstallation.getTriple().str() + "/bin")
-                        .str());
- 
-+  // Comment out the distro-specific tweaks so that they don't bite when
-+  // using Guix on a foreign distro.
-+#if 0
-   Distro Distro = DetectDistro(D, Arch);
- 
-   if (IsOpenSUSE(Distro) || IsUbuntu(Distro)) {
-@@ -3702,6 +3705,7 @@
- 
-   if (IsOpenSUSE(Distro))
-     ExtraOpts.push_back("--enable-new-dtags");
-+#endif
- 
-   // The selection of paths to try here is designed to match the patterns which
-   // the GCC driver itself uses, as this is part of the GCC-compatible driver.
-@@ -3771,14 +3775,12 @@
-     addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths);
-   }
- 
--  addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
--  addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
--  addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
--  addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
--
-   // Try walking via the GCC triple path in case of biarch or multiarch GCC
-   // installations with strange symlinks.
-   if (GCCInstallation.isValid()) {
-+    // The following code would end up adding things like
-+    // "/usr/lib/x86_64-unknown-linux-gnu/../../lib64" to the search path.
-+#if 0
-     addPathIfExists(D,
-                     SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
-                         "/../../" + OSLibDir,
-@@ -3791,6 +3793,7 @@
-                              BiarchSibling.gccSuffix(),
-                       Paths);
-     }
-+#endif
- 
-     // See comments above on the multilib variant for details of why this is
-     // included even from outside the sysroot.
-@@ -3815,8 +3818,9 @@
-   if (StringRef(D.Dir).startswith(SysRoot))
-     addPathIfExists(D, D.Dir + "/../lib", Paths);
- 
--  addPathIfExists(D, SysRoot + "/lib", Paths);
--  addPathIfExists(D, SysRoot + "/usr/lib", Paths);
-+  // Add libc's lib/ directory to the search path, so that crt1.o, crti.o,
-+  // and friends can be found.
-+  addPathIfExists(D, "@GLIBC_LIBDIR@", Paths);
- }
- 
- bool Linux::HasNativeLLVMSupport() const { return true; }