Synchronize mozconfig files with their version from tor-browser.git

The main change is the removal of the --enable-jemalloc=4 option which
was done with #22482.

projects/firefox/mozconfig-linux-i686

@@ -31,7 +31,6 @@ ac_add_options --disable-debug
 ac_add_options --disable-maintenance-service
 ac_add_options --disable-crashreporter
 ac_add_options --disable-webrtc
-# Let's not compile EME at least until we can enable ClearKey and only Clearkey.
+# Let's make sure no preference is enabling either Adobe's or Google's CDM.
 ac_add_options --disable-eme
 #ac_add_options --disable-ctypes
-ac_add_options --enable-jemalloc=4

projects/firefox/mozconfig-linux-x86_64

@@ -23,7 +23,6 @@ ac_add_options --disable-debug
 ac_add_options --disable-maintenance-service
 ac_add_options --disable-crashreporter
 ac_add_options --disable-webrtc
-# Let's not compile EME at least until we can enable ClearKey and only Clearkey.
+# Let's make sure no preference is enabling either Adobe's or Google's CDM.
 ac_add_options --disable-eme
 #ac_add_options --disable-ctypes
-ac_add_options --enable-jemalloc=4

projects/firefox/mozconfig-osx-x86_64

@@ -50,7 +50,6 @@ ac_add_options --disable-crashreporter
 ac_add_options --disable-maintenance-service
 ac_add_options --disable-webrtc
 ac_add_options --disable-tests
-# Let's not compile EME at least until we can enable ClearKey and only Clearkey.
-# (Apart from that there is no Adobe CRM module for OS X right now)
+# Let's make sure no preference is enabling either Adobe's or Google's CDM.
 ac_add_options --disable-eme
 # ac_add_options --disable-ctypes

projects/firefox/mozconfig-windows-i686

@@ -21,7 +21,7 @@ ac_add_options --enable-verify-mar
 # We can't build the sandbox code with mingw-w64:
 # https://bugzilla.mozilla.org/show_bug.cgi?id=1042426
 ac_add_options --disable-sandbox
-# EME is not running without sandbox. Thus, don't compile it in the first place.
+# Let's make sure no preference is enabling either Adobe's or Google's CDM.
 ac_add_options --disable-eme
 ac_add_options --disable-crashreporter
 ac_add_options --disable-maintenance-service