Fix typo in condition (if linux) for setting the SETCAP/setcap target

As reported via irc by Nelgin, the setcap target was not being passed to 'make -C src/sbbs3' by default (on Linux) due to a misplaced paren.

Fix typo in condition (if linux) for setting the SETCAP/setcap target
a1d0be8c · Rob Swindell · 6b5de04a · a1d0be8c
Commit a1d0be8c authored 3 years ago by Rob Swindell
--- a/install/GNUmakefile
+++ b/install/GNUmakefile
@@ -80,7 +80,7 @@ endif
 MKFLAGS	+=	os=$(os)

 ifndef NOCAP
-ifeq (($os),linux)
+ifeq ($(os),linux)
 	SETCAP 	:=	setcap
 endif
 endif