config.mak.uname: remove unused the NO_R_TO_GCC_LINKER flag

The NO_R_TO_GCC_LINKER flag was still being on some platforms. It
hasn't been used since my 0f50c8e ("Makefile: remove the
NO_R_TO_GCC_LINKER flag", 2019-05-17).

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

config.mak.uname

@@ -636,7 +636,6 @@ ifneq (,$(wildcard ../THIS_IS_MSYSGIT))
 	prefix =
 	INSTALL = /bin/install
 	EXTLIBS += /mingw/lib/libz.a
-	NO_R_TO_GCC_LINKER = YesPlease
 	INTERNAL_QSORT = YesPlease
 	HAVE_LIBCHARSET_H = YesPlease
 	NO_GETTEXT = YesPlease
@@ -669,7 +668,6 @@ else
 			-fstack-protector-strong
 		EXTLIBS += -lntdll
 		INSTALL = /bin/install
-		NO_R_TO_GCC_LINKER = YesPlease
 		INTERNAL_QSORT = YesPlease
 		HAVE_LIBCHARSET_H = YesPlease
 		NO_GETTEXT =
@@ -695,7 +693,6 @@ ifeq ($(uname_S),QNX)
 	NO_MKDTEMP = YesPlease
 	NO_NSEC = YesPlease
 	NO_PTHREADS = YesPlease
-	NO_R_TO_GCC_LINKER = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease
 endif