toolchain.eclass: [QA] Remove meaningless USE=multislot, #584610

The USE=multislot as defined partially by toolchain.eclass and partially
by sys-devel/gcc was used for two purposes:

- enabling build-time (only) blockers on old gcc versions -- which do
  not make any sense because they are build-time only and there is no
  technical reason for two gcc version ranges not to be installed at
  the same time, both at build time and at run time,

- changing behavior of post-install wrt conditional gcc-config calls.

Both cases are invalid use of USE flags, considering that the flag does
not affect the installed files in any way.

1 files changed, 0 insertions, 1 deletions

diff --git a/sys-devel/gcc/metadata.xml b/sys-devel/gcc/metadata.xml
index 7b6c493e9e5d..38f4396bcaaa 100644
--- a/sys-devel/gcc/metadata.xml
+++ b/sys-devel/gcc/metadata.xml
@@ -21,7 +21,6 @@
       code in the C library (DO NOT ENABLE THIS IF YOU DON'T KNOW WHAT IT DOES)</flag>
     <flag name="mpx">Enable support for Intel Memory Protection Extensions (MPX)</flag>
     <flag name="mudflap">Add support for mudflap, a pointer use checking library</flag>
-    <flag name="multislot">Allow for multiple versions to be emerged at once for same CTARGET</flag>
     <flag name="nopie">Disable PIE support (NOT FOR GENERAL USE)</flag>
     <flag name="nossp">Disable SSP support (NOT FOR GENERAL USE)</flag>
     <flag name="objc">Build support for the Objective C code language</flag>