Bug 1820572 - Make python/mozbuild/mozbuild/test/frontend/data buildable outside of a unified build environment r=andi,glandium

Differential Revision: https://phabricator.services.mozilla.com/D171731

python/mozbuild/mozbuild/test/frontend/data/allow-compiler-warnings/moz.build

@@ -18,5 +18,3 @@ Library("dummy")
 UNIFIED_SOURCES += ["test1.c"]
 
 AllowCompilerWarnings()
-
-REQUIRES_UNIFIED_BUILD = True

python/mozbuild/mozbuild/test/frontend/data/compile-flags-templates/moz.build

@@ -25,5 +25,3 @@ UNIFIED_SOURCES += ["test1.c"]
 
 DisableStlWrapping()
 NoVisibilityFlags()
-
-REQUIRES_UNIFIED_BUILD = True

python/mozbuild/mozbuild/test/frontend/data/disable-compiler-warnings/moz.build

@@ -18,5 +18,3 @@ Library("dummy")
 UNIFIED_SOURCES += ["test1.c"]
 
 DisableCompilerWarnings()
-
-REQUIRES_UNIFIED_BUILD = True

python/mozbuild/mozbuild/test/frontend/data/disable-stl-wrapping/moz.build

@@ -19,5 +19,3 @@ def DisableStlWrapping():
 UNIFIED_SOURCES += ["test1.c"]
 
 DisableStlWrapping()
-
-REQUIRES_UNIFIED_BUILD = True

python/mozbuild/mozbuild/test/frontend/data/visibility-flags/moz.build

@@ -19,5 +19,3 @@ def NoVisibilityFlags():
 UNIFIED_SOURCES += ["test1.c"]
 
 NoVisibilityFlags()
-
-REQUIRES_UNIFIED_BUILD = True