Revert "Split the x86 host toolchain into glibc and musl variants"

This reverts commit 4fb4ef22424162d73bb0473ff53dc557b3fec79f.

Reason for revert: crossed with aosp/1775072

Change-Id: Ied922850b810d82627ba4f9ee42f672cfe286c91
diff --git a/android/arch_test.go b/android/arch_test.go
index a828321..2a2fd45 100644
--- a/android/arch_test.go
+++ b/android/arch_test.go
@@ -508,12 +508,9 @@
 				bionic: { a:  ["bionic"] },
 				host: { a: ["host"] },
 				android: { a:  ["android"] },
-				glibc: { a:  ["glibc"] },
-				musl: { a:  ["musl"] },
 				linux_bionic: { a:  ["linux_bionic"] },
 				linux: { a:  ["linux"] },
 				linux_glibc: { a:  ["linux_glibc"] },
-				linux_musl: { a:  ["linux_musl"] },
 				windows: { a:  ["windows"], enabled: true },
 				darwin: { a:  ["darwin"] },
 				not_windows: { a:  ["not_windows"] },
@@ -525,8 +522,6 @@
 				linux_x86_64: { a:  ["linux_x86_64"] },
 				linux_glibc_x86: { a:  ["linux_glibc_x86"] },
 				linux_glibc_x86_64: { a:  ["linux_glibc_x86_64"] },
-				linux_musl_x86: { a:  ["linux_musl_x86"] },
-				linux_musl_x86_64: { a:  ["linux_musl_x86_64"] },
 				darwin_x86_64: { a:  ["darwin_x86_64"] },
 				windows_x86: { a:  ["windows_x86"] },
 				windows_x86_64: { a:  ["windows_x86_64"] },
@@ -568,12 +563,12 @@
 				{
 					module:   "foo",
 					variant:  "linux_glibc_x86_64",
-					property: []string{"root", "host", "linux", "glibc", "linux_glibc", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_glibc_x86_64"},
+					property: []string{"root", "host", "linux", "linux_glibc", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_glibc_x86_64"},
 				},
 				{
 					module:   "foo",
 					variant:  "linux_glibc_x86",
-					property: []string{"root", "host", "linux", "glibc", "linux_glibc", "not_windows", "x86", "lib32", "linux_x86", "linux_glibc_x86"},
+					property: []string{"root", "host", "linux", "linux_glibc", "not_windows", "x86", "lib32", "linux_x86", "linux_glibc_x86"},
 				},
 			},
 		},
@@ -600,23 +595,6 @@
 			},
 		},
 		{
-			name:     "linux_musl",
-			goOS:     "linux",
-			preparer: FixtureModifyConfig(modifyTestConfigForMusl),
-			results: []result{
-				{
-					module:   "foo",
-					variant:  "linux_musl_x86_64",
-					property: []string{"root", "host", "linux", "musl", "linux_glibc", "linux_musl", "not_windows", "x86_64", "lib64", "linux_x86_64", "linux_musl_x86_64", "linux_glibc_x86_64"},
-				},
-				{
-					module:   "foo",
-					variant:  "linux_musl_x86",
-					property: []string{"root", "host", "linux", "musl", "linux_glibc", "linux_musl", "not_windows", "x86", "lib32", "linux_x86", "linux_musl_x86", "linux_glibc_x86"},
-				},
-			},
-		},
-		{
 			name: "darwin",
 			goOS: "darwin",
 			results: []result{