trousers/tpm-tools: enable on ARC

With the latest ARC toolchain arc-2018.03 builds of "trousers" and
"tpm-tools" packages perform without errors.
Lets enable these packages for ARC.

With the exception, building tpm-tools for ARC770/750 requires to pass
"-mno-compact-casesi" as it was made for trousers before:
see patch f4cd8ceb9cfa "trousers: Pass "-mno-compact-casesi" when
building for ARCv1".
This change is a temporary workaround and the feature is going to be
fixed in the next ARC toolchain release version.

Signed-off-by: Evgeniy Didin <didin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: arc-buildroot@synopsys.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/tpm-tools/Config.in

@@ -2,7 +2,6 @@ config BR2_PACKAGE_TPM_TOOLS
 	bool "tpm-tools"
 	depends on BR2_TOOLCHAIN_HAS_THREADS # trousers
 	depends on !BR2_STATIC_LIBS # trousers
-	depends on !BR2_arc # trousers
 	select BR2_PACKAGE_TROUSERS
 	select BR2_PACKAGE_OPENSSL
 	help
@@ -12,4 +11,3 @@ config BR2_PACKAGE_TPM_TOOLS
 
 comment "tpm-tools needs a toolchain w/ threads, dynamic library"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
-	depends on !BR2_arc

package/tpm-tools/tpm-tools.mk

@@ -16,4 +16,8 @@ ifeq ($(BR2_PACKAGE_LIBICONV),y)
 TPM_TOOLS_CONF_ENV += LIBS='-liconv'
 endif
 
+ifeq ($(BR2_arc770d)$(BR2_arc750d),y)
+TPM_TOOLS_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -mno-compact-casesi"
+endif
+
 $(eval $(autotools-package))

package/trousers/Config.in

@@ -3,8 +3,6 @@ config BR2_PACKAGE_TROUSERS
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	# doesn't build properly in static only configurations
 	depends on !BR2_STATIC_LIBS
-	# ARC toolchain issue
-	depends on !BR2_arc
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
 	help
@@ -18,4 +16,3 @@ config BR2_PACKAGE_TROUSERS
 
 comment "trousers needs a toolchain w/ threads, dynamic library"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
-	depends on !BR2_arc