kernel/modsign_certificate.S: fix build on parisc architecture

Module signing functionality breaks the kernel build on parisc with the following error:

kernel/built-in.o: In function `load_module_signing_keys':
kernel/modsign_pubkey.c:67: undefined reference to modsign_certificate_list_end' kernel/modsign_pubkey.c:66: undefined reference to modsign_certificate_list' make[3]: *** [vmlinux] Error 1

The reason why the build fails is because on parisc assembly syntax is different than on other architectures. Most importantly, a semicolon marks the start of a comment, while exclamation marks separates statements.

Currently the GLOBAL(name) macro uses a semicolon to separate the .globl and the ASM_SYMBOL() statements. On PA-RISC the semicolon will now just strip the ASM_SYMBOL() statements since it thinks it is a comment and as such the modsign_certificate_list/modsign_certificate_list_end symbols will not get defined and will not be in the vmlinux binary.

Fix this problem by adding an own implementation for GLOBAL() on the PARISC architecture.

index 246b4c6..9b9c2ab 100644
@@ -7,9 +7,17 @@
 #define ASM_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
 #endif
 
-#define GLOBAL(name)	\
-	.globl ASM_SYMBOL(name);	\
+#if defined(__hppa__)
+ /* HPPA/PA-RISC assembly is special: comments start with semicolon
+  * and exclamation marks separates statements. */
+ #define GLOBAL(name)	\
+	.globl ASM_SYMBOL(name) ! \
 	ASM_SYMBOL(name):
+#else
+ #define GLOBAL(name)	\
+	.globl ASM_SYMBOL(name) ; \
+	ASM_SYMBOL(name):
+#endif
 
 	.section ".init.data","aw"