Hack-fix build breakage on Linux/GCC from fc4856f9

For some reason, the new `GccIsClang` variable introduced via fc4856f9 for addressing #8148 isn't set explicitly to `NO`; so this simply changes the test `ifeq $(GccIsClang) NO` to `ifneq $(GccIsClang) YES` which should fix the build with and w/o Clang.

Hack-fix build breakage on Linux/GCC from fc4856f9
For some reason, the new `GccIsClang` variable introduced via fc4856f9 for addressing #8148 isn't set explicitly to `NO`; so this simply changes the test `ifeq $(GccIsClang) NO` to `ifneq $(GccIsClang) YES` which should fix the build with and w/o Clang.
5a3918fe · Herbert Valerio Riedel · fc4856f9 · 5a3918fe
Commit 5a3918fe authored Sep 04, 2013 by Herbert Valerio Riedel 🕺
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mk/validate-settings.mk mk/validate-settings.mk +1 -1

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--- a/mk/validate-settings.mk
+++ b/mk/validate-settings.mk
@@ -10,7 +10,7 @@ HADDOCK_DOCS    = YES
 #####################
 # Warnings

-ifeq "$(GccIsClang)" "NO"
+ifneq "$(GccIsClang)" "YES"

 # Debian doesn't turn -Werror=unused-but-set-variable on by default, so
 # we turn it on explicitly for consistency with other users