Remove extra semicolon outside of a function

Without this change, compiling with gcc and pedantic generates warning:
ISO C does not allow extra ‘;’ outside of a function.

src/describe.c

@@ -19,7 +19,7 @@
 #include "vector.h"
 #include "repository.h"
 
-GIT__USE_OIDMAP;
+GIT__USE_OIDMAP
 
 /* Ported from https://github.com/git/git/blob/89dde7882f71f846ccd0359756d27bebc31108de/builtin/describe.c */
 

src/indexer.c

@@ -18,7 +18,7 @@
 #include "oidmap.h"
 #include "zstream.h"
 
-GIT__USE_OIDMAP;
+GIT__USE_OIDMAP
 
 extern git_mutex git__mwindow_mutex;
 

src/pack-objects.c

@@ -41,7 +41,7 @@ struct pack_write_context {
 	git_transfer_progress *stats;
 };
 
-GIT__USE_OIDMAP;
+GIT__USE_OIDMAP
 
 #ifdef GIT_THREADS
 

src/pack.c

@@ -16,8 +16,8 @@
 
 #include <zlib.h>
 
-GIT__USE_OFFMAP;
-GIT__USE_OIDMAP;
+GIT__USE_OFFMAP
+GIT__USE_OIDMAP
 
 static int packfile_open(struct git_pack_file *p);
 static git_off_t nth_packed_object_offset(const struct git_pack_file *p, uint32_t n);

src/revwalk.c

@@ -14,7 +14,7 @@
 #include "git2/revparse.h"
 #include "merge.h"
 
-GIT__USE_OIDMAP;
+GIT__USE_OIDMAP
 
 git_commit_list_node *git_revwalk__commit_lookup(
 	git_revwalk *walk, const git_oid *oid)