internal/rosa/cmake: disable nuisance warnings

Author warnings are pointless here, and it makes no sense to make CMAKE_<LANG>_COMPILER_TARGET optional just to shut cmake up.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/cmake.go

@@ -84,6 +84,7 @@ func (attr *CMakeHelper) script(t Toolchain, name string) string {
 
 	return `
 cmake -G ` + generate + ` \
+	-Wno-author -Wno-unused-cli \
 	-DCMAKE_C_COMPILER_TARGET="${ROSA_TRIPLE}" \
 	-DCMAKE_CXX_COMPILER_TARGET="${ROSA_TRIPLE}" \
 	-DCMAKE_ASM_COMPILER_TARGET="${ROSA_TRIPLE}" \