Replace sccache with ccache for WoA bots (#68)

ccache is now available on Windows on Arm machines and this
patch will enable to use to ccache instead of sccache on all
Windows on Arm buildbots hosted by Linaro.

Author: omjavaid

buildbot/osuosl/master/config/builders.py

@@ -268,8 +268,8 @@
                     extra_cmake_args=[
                         "-DCMAKE_TRY_COMPILE_CONFIGURATION=Release",
                         "-DLLVM_TARGETS_TO_BUILD='AArch64'",
-                        "-DCMAKE_C_COMPILER_LAUNCHER=sccache",
-                        "-DCMAKE_CXX_COMPILER_LAUNCHER=sccache"])},
+                        "-DCMAKE_C_COMPILER_LAUNCHER=ccache",
+                        "-DCMAKE_CXX_COMPILER_LAUNCHER=ccache"])},
 
     ## ARMv8 check-all
     {'name' : "clang-armv8-quick",
@@ -545,8 +545,8 @@
                     checkout_flang=True,
                     extra_cmake_args=[
                         "-DCMAKE_TRY_COMPILE_CONFIGURATION=Release",
-                        "-DCMAKE_C_COMPILER_LAUNCHER=sccache",
-                        "-DCMAKE_CXX_COMPILER_LAUNCHER=sccache",
+                        "-DCMAKE_C_COMPILER_LAUNCHER=ccache",
+                        "-DCMAKE_CXX_COMPILER_LAUNCHER=ccache",
                         # FIXME: compiler-rt\lib\sanitizer_common\sanitizer_unwind_win.cpp assumes WIN64 is x86_64,
                         #        so, before that's fixed, disable everything that triggers its build.
                         "-DCOMPILER_RT_BUILD_SANITIZERS=OFF",
@@ -1300,8 +1300,8 @@
                     clean=True,
                     test=True,
                     extra_cmake_args=[
-                        "-DCMAKE_C_COMPILER_LAUNCHER=sccache",
-                        "-DCMAKE_CXX_COMPILER_LAUNCHER=sccache",
+                        "-DCMAKE_C_COMPILER_LAUNCHER=ccache",
+                        "-DCMAKE_CXX_COMPILER_LAUNCHER=ccache",
                         '-DLLVM_LIT_ARGS=-v',
                         '-DLLDB_TEST_USER_ARGS=--skip-category=watchpoint'])},