bug 1355099 - Disable sccache on clang-cl builds. r=mshal

sccache doesn't actually support clang-cl currently, so we're just making
our clang-cl builds slower by enabling it. Also, I'm trying to update to
a newer version of sccache and something broke running sccache+clang-cl
entirely so my try builds are busted, so disabling it entirely until
we actually support this configuration seems sensible.

MozReview-Commit-ID: LMkVuBRclCp

--HG--
extra : rebase_source : 76357d16190a6d2b2c5f177874de00ed3e636a76

browser/config/mozconfigs/win32/clang

@@ -12,5 +12,4 @@ ac_add_options --enable-clang-plugin
 . $topsrcdir/build/win32/mozconfig.vs-latest
 
 . "$topsrcdir/build/mozconfig.common.override"
-. "$topsrcdir/build/mozconfig.cache"
 . "$topsrcdir/build/mozconfig.clang-cl"

browser/config/mozconfigs/win32/clang-debug

@@ -13,5 +13,4 @@ ac_add_options --enable-clang-plugin
 . $topsrcdir/build/win32/mozconfig.vs-latest
 
 . "$topsrcdir/build/mozconfig.common.override"
-. "$topsrcdir/build/mozconfig.cache"
 . "$topsrcdir/build/mozconfig.clang-cl"

browser/config/mozconfigs/win32/debug-static-analysis

@@ -13,5 +13,4 @@ ac_add_options --enable-clang-plugin
 . $topsrcdir/build/win32/mozconfig.vs-latest
 
 . "$topsrcdir/build/mozconfig.common.override"
-. "$topsrcdir/build/mozconfig.cache"
 . "$topsrcdir/build/mozconfig.clang-cl"

browser/config/mozconfigs/win64/clang

@@ -14,5 +14,4 @@ ac_add_options --enable-clang-plugin
 . $topsrcdir/build/win64/mozconfig.vs-latest
 
 . "$topsrcdir/build/mozconfig.common.override"
-. "$topsrcdir/build/mozconfig.cache"
 . "$topsrcdir/build/mozconfig.clang-cl"

browser/config/mozconfigs/win64/clang-debug

@@ -15,5 +15,4 @@ ac_add_options --enable-clang-plugin
 . $topsrcdir/build/win64/mozconfig.vs-latest
 
 . "$topsrcdir/build/mozconfig.common.override"
-. "$topsrcdir/build/mozconfig.cache"
 . "$topsrcdir/build/mozconfig.clang-cl"